subsong

[ suhb-sawng, -song ]
/ ˈsʌbˌsɔŋ, -ˌsɒŋ /

noun

an unstructured, often rambling vocalization of low volume heard in young birds and, at the start of the breeding season, in adult birds of certain species.

Origin of subsong

British Dictionary definitions for subsong

subsong
/ (ˈsʌbˌsɒŋ) /

noun

a subdued form of birdsong modified from the full territorial song and used by some birds esp in courtship