An echo subject is a

verb A verb () is a word (part of speech) that in syntax generally conveys an action (''bring'', ''read'', ''walk'', ''run'', ''learn''), an occurrence (''happen'', ''become''), or a state of being (''be'', ''exist'', ''stand''). In the usual descri ...

that has the same subject as the preceding verb. In some languages, such as Erromangan, it is commonly marked with a special reduced set of prefixes which replace the full set of subject prefixes.https://openresearch-repository.anu.edu.au/bitstream/1885/145228/1/PL-C79.pdf

References

Verbs Human communication {{grammar-stub