Meaning

noun a sharp sound made by small birds or insects

verb make high-pitched sounds

verb sing in modulation

originFrom Middle English *chirpen (attested only in the derivative Middle English chirpinge, cyrpynge, chyrypynge (“chirping”). Compare Middle English chirken and chirmen. More at chirk, chirm. Compare also Middle English chirten (“to smack, chirrup”).

Etymology from Wiktionary, CC BY-SA 3.0