A knacker (), knackerman or knacker man is a person who removes and clears animal carcasses (dead, dying, injured) from private

farms A farm (also called an agricultural holding) is an area of land that is devoted primarily to agricultural processes with the primary objective of producing food and other crops; it is the basic facility in food production. The name is used fo ...

or public

highways A highway is any public or private road or other public way on land. It includes not just major roads, but also other public roads and rights of way. In the United States, it is also used as an equivalent term to controlled-access highway, or ...

and renders the collected carcasses into by-products such as

fat In nutrition science, nutrition, biology, and chemistry, fat usually means any ester of fatty acids, or a mixture of such chemical compound, compounds, most commonly those that occur in living beings or in food. The term often refers specif ...

tallow Tallow is a rendered form of beef or mutton suet, primarily made up of triglycerides. In industry, tallow is not strictly defined as beef or mutton suet. In this context, tallow is animal fat that conforms to certain technical criteria, inc ...

( yellow grease),

glue Adhesive, also known as glue, cement, mucilage, or paste, is any non-metallic substance applied to one or both surfaces of two separate items that binds them together and resists their separation. The use of adhesives offers certain advantage ...

gelatin Gelatin or gelatine () is a translucent, colorless, flavorless food ingredient, commonly derived from collagen taken from animal body parts. It is brittle when dry and rubbery when moist. It may also be referred to as hydrolyzed collagen, coll ...

, bone meal, bone char, sal ammoniac,

soap Soap is a salt (chemistry), salt of a fatty acid (sometimes other carboxylic acids) used for cleaning and lubricating products as well as other applications. In a domestic setting, soaps, specifically "toilet soaps", are surfactants usually u ...

bleach Bleach is the generic name for any chemical product that is used industrially or domestically to remove color from (i.e. to whiten) fabric or fiber (in a process called bleaching) or to disinfect after cleaning. It often refers specifically t ...

and

animal feed Animal feed is food given to domestic animals, especially livestock, in the course of animal husbandry. There are two basic types: fodder and forage. Used alone, the word ''feed'' more often refers to fodder. Animal feed is an important input ...

. A knacker's yard or a knackery is different from a

slaughterhouse In livestock agriculture and the meat industry, a slaughterhouse, also called an abattoir (), is a facility where livestock animals are slaughtered to provide food. Slaughterhouses supply meat, which then becomes the responsibility of a mea ...

or abattoir, where animals are slaughtered for human consumption. Since the

Middle Ages In the history of Europe, the Middle Ages or medieval period lasted approximately from the 5th to the late 15th centuries, similarly to the post-classical period of global history. It began with the fall of the Western Roman Empire and ...

, the occupation of "knacker man" was frequently considered a disreputable occupation. Knackers were often also commissioned by the courts as public

executioner An executioner, also known as a hangman or headsman, is an official who effects a sentence of capital punishment on a condemned person. Scope and job The executioner was usually presented with a warrant authorizing or ordering him to ...

Etymology

The oldest recorded use of the word "knacker" dates to 1812, meaning "one who slaughters old or sick horses" and in 1855 "to kill, castrate", and is believed to be the same word as the earlier knacker/nacker "harness-maker" from the 1570s, surviving in 18th century dialects. The sense extension is perhaps because "knackers" provided farmers with general help in horse matters, including the disposal of dead horses and animals. The word is of uncertain origin, perhaps from the Scandinavian word represented by Old Norse ''hnakkur'', saddle, and related to ''hnakki'', "back of the neck", possibly relating to neck.

Legal definition

The term is in this literal sense in

British English British English is the set of Variety (linguistics), varieties of the English language native to the United Kingdom, especially Great Britain. More narrowly, it can refer specifically to the English language in England, or, more broadly, to ...

and

Irish English Hiberno-English or Irish English (IrE), also formerly sometimes called Anglo-Irish, is the set of dialects of English native to the island of Ireland. In both the Republic of Ireland and Northern Ireland, English is the first language in e ...

, and gained some notoriety during the outbreak of

mad cow disease Bovine spongiform encephalopathy (BSE), commonly known as mad cow disease, is an incurable and always fatal neurodegenerative disease of cattle. Symptoms include abnormal behavior, trouble walking, and weight loss. Later in the course of th ...

(BSE) in the United Kingdom. The ''Slaughterhouses Act'' 1974, the ''Meat (Sterilisation and Staining) Regulations'' 1982, and the ''Food Safety Act'' 1990 all define a "knacker's yard" as "any premises used in connection with the business of slaughtering,

skinning Skinning is the act of skin removal. The process is done by humans to animals, mainly as a means to prepare the meat beneath for cooking and consumption, or to harvest the skin for making fur clothing or tanning it to make leather. The sk ...

or cutting up animals whose flesh is not intended for human consumption". Knackery by-products are rendered under regulation into fats and meat and bone meal for incineration. Cattle hides may be recovered for leather production. The kinds of animal processing which can occur at knackeries are defined by law, for example, in Australia by the Commonwealth ''Meat Inspection Act'' 1983. In the EU, the legislation covering knackeries is Regulation (EC) No 1069/2009 of 21 October 2009. It regulates animal by-products and derived products not intended for human consumption.

Slang use

"Knackered" meaning tired, exhausted or broken in British and Irish slang is commonly used in Australia, Ireland,

Newfoundland Newfoundland and Labrador is the easternmost province of Canada, in the country's Atlantic region. The province comprises the island of Newfoundland and the continental region of Labrador, having a total size of . As of 2025 the population ...

New Zealand New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of isla ...

, and the United Kingdom. The term "knacker drinking" refers to the practice of consuming

alcohol Alcohol may refer to: Common uses * Alcohol (chemistry), a class of compounds * Ethanol, one of several alcohols, commonly known as alcohol in everyday life ** Alcohol (drug), intoxicant found in alcoholic beverages ** Alcoholic beverage, an alco ...

in the open, e.g. in a field or a park, or by a roadside or canal; the drink is typically cheap

cider Cider ( ) is an alcoholic beverage made from the Fermented drink, fermented Apple juice, juice of apples. Cider is widely available in the United Kingdom (particularly in the West Country) and Ireland. The United Kingdom has the world's highest ...

beer Beer is an alcoholic beverage produced by the brewing and fermentation of starches from cereal grain—most commonly malted barley, although wheat, maize (corn), rice, and oats are also used. The grain is mashed to convert starch in the ...

vodka Vodka ( ; is a clear distilled beverage, distilled alcoholic beverage. Its varieties originated in Poland and Russia. Vodka is composed mainly of water and ethanol but sometimes with traces of impurities and flavourings. Traditionally, it is ...

from an off licence. "Knacker drinking" is commonly done by teenagers or students. The British satirical magazine ''

Private Eye ''Private Eye'' is a British fortnightly satirical and current affairs (news format), current affairs news magazine, founded in 1961. It is published in London and has been edited by Ian Hislop since 1986. The publication is widely recognised ...

'' often refers to senior police figures as " Inspector Knacker" or the police force in general as "Knacker of the Yard", a reference to Jack "Slipper of the Yard" Slipper. Automotive junkyards, salvage yards or recyclers may also be referred to as "knackers' yards" or "knackers". The word has also been used as a derogatory term against members of the Travelling Community in Ireland. There have been some calls to cease the use of slang terms like "knacker drinking" and "knackered" as a result. "Knackers" is also a British/Australasian vulgar slang for

testes A testicle or testis ( testes) is the gonad in all male bilaterians, including humans, and is homologous to the ovary in females. Its primary functions are the production of sperm and the secretion of androgens, primarily testosterone. The ...

,e.g. Thomas in ''

The Virgin Soldiers ''The Virgin Soldiers'' is a 1966 comic novel by Leslie Thomas, inspired by his own experiences of National Service in the British Army. It was Thomas' debut novel; he had previously published an autobiography. ''The Virgin Soldiers'' sold mill ...

'' although this usage may be derived from nakerssmall medieval kettle drums which were typically played in pairs suspended from a belt around the waist.

References

{{Authority control Pejorative terms for people Animal husbandry occupations Irish slang British slang Livestock