chirrup
Concise Oxford English Dictionary © 2008 Oxford University Press:
chirrup/ˈtʃɪrəp/
▶verb (chirrups, chirruping, chirruped) (of a small bird) make repeated short high-pitched sounds. ▶noun a chirruping sound.
– derivatives
chirrupy adjective.
chirrupy adjective.
'chirrup' also found in these Oxford entries:

