From The Collaborative International Dictionary of English v.0.48 [gcide]:
Chirrup \Chir"rup\, v. t. [imp. & p. p. Chirruped; p. pr. &
vb. n. Chirruping.] [See Chirp.]
To quicken or animate by chirping; to cherup.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Chirrup \Chir"rup\, v. i.
To chirp. --Tennyson.
[1913 Webster]
The criket chirrups on the hearth. --Goldsmith.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Chirrup \Chir"rup\, n.
The act of chirping; a chirp.
[1913 Webster]
The sparrows' chirrup on the roof. --Tennyson.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
chirrup
n 1: a series of chirps [syn: chirrup, twitter]
v 1: make high-pitched sounds; "the birds were chirping in the
bushes" [syn: peep, cheep, chirp, chirrup]