"Bread and butter" is a

superstitious A superstition is any belief or practice considered by non-practitioners to be irrational or supernatural, attributed to fate or magic, perceived supernatural influence, or fear of that which is unknown. It is commonly applied to beliefs and pr ...

blessing In religion, a blessing (also used to refer to bestowing of such) is the impartation of something with grace, holiness, spiritual redemption, or divine will. Etymology and Germanic paganism The modern English language term ''bless'' likely ...

or charm, typically said by young couples or friends walking together when they are forced to separate by an obstacle, such as a pole or another person. By saying the phrase, the bad luck of letting something come between them is thought to be averted. Both walkers must say the phrase, and if they do not do this, then a bitter quarrel is expected to occur. The concept derives from the difficulty of separating butter from bread once it has been spread – buttered bread cannot be "unbuttered". Another phrase used in this way is "

salt and pepper Salt and pepper is the common name for edible salt and ground black pepper, which are ubiquitously paired on Western dining tables as to allow for the additional seasoning of food after its preparation. During food preparation or cooking, they m ...

References

{{Superstitions Luck English-language idioms