IPA: /ˈnɛstmeɪt/
KK: /nɛstmeɪt/
A young animal, especially a bird, that shares a nest with its siblings or other young animals.
The nestmates chirped together as they waited for their mother to bring food.
Nestmate → It is formed from "nest" (from Old English *nest*, meaning a structure built by birds for laying eggs) and "mate" (from Old English *gemetta*, meaning a companion or partner). The word "nestmate" refers to a companion or fellow inhabitant of a nest.
Think of a 'nest' where birds live and a 'mate' as a companion — a nestmate is simply a companion that shares the nest.