1) Birdlike sound 2) Make clucking sounds 3) Make high-pitched sounds 4) Sound 5) To express by chirping 6) Twitter 1) Chirp 2) Chitter 3) Peep 4) Sing 5) Trill 6) Tweet 7) Twitter 
• (v. i.) To chirp. • (n.) The act of chirping; a chirp. • (v. t.) To quicken or animate by chirping; to cherup.
Chir'rup intransitive verb To chirp. Tennyson. « The criket chirrups on the hearth. Goldsmith. » Chir'rup noun The act of chirping; a chirp. « The sparrows' chirrup on the roof. Tennyson. » Chir'rup transitive verb [ imperfect & past participle Chirruped ; present participle & verbal noun Chirruping .] [ See Chirp .] To quicken or animate by chirping; to cherup. 
[n] - a series of chirps
twitter noun a series of chirps