chiffchaff

noun

1. A small, common warbler, of species Phylloscopus collybita, with yellowish-green plumage that breeds throughout northern and temperate Europe and Asia.
2. Any of several other species of the same genus.

intj

1. (UK, onomatopoeic, uncountable)The song of the chiffchaff.

   “I thought I heard something singing chiffchaff, chiffchaff. So I had a look and there was a chiffchaff.”