RhymeZone: chiffchaff definitions

Definitions of chiffchaff:

noun: A small, common warbler, Phylloscopus collybita, with yellowish-green plumage that breeds throughout northern and temperate Europe and Asia.
noun: Any of several other species of the same genus.
noun: (UK, onomatopoeic, uncountable) The song of the chiffchaff.

(Definitions from Wiktionary)