From The Collaborative International Dictionary of English v.0.48 [gcide]:
Cheep \Cheep\ (ch[=e]p), v. i. [imp. & p. p. Cheeped
(ch[=e]pt).] [Cf. Chirp].
To chirp, as a young bird.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Cheep \Cheep\, v. t.
To give expression to in a chirping tone.
[1913 Webster]
Cheep and twitter twenty million loves. --Tennyson.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Cheep \Cheep\, n.
A chirp, peep, or squeak, as of a young bird or mouse.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
cheep
n 1: the short weak cry of a young bird [syn: cheep, peep]
v 1: make high-pitched sounds; "the birds were chirping in the
bushes" [syn: peep, cheep, chirp, chirrup]