Webster’s Revised Unabridged Dictionary · 1913
Chirrup
Chir′rup (chĭr′rŭp), v. t. [imp. & p. p. Chirruped; p. pr. & vb. n. Chirruping.] [See Chirp.] To quicken or animate by chirping; to cherup.
Chir′rup, v. i. To chirp. Tennyson.
The criket chirrups on the hearth. Goldsmith.
Chir′rup, n. The act of chirping; a chirp.
The sparrows' chirrup on the roof. Tennyson.