Webster's 1828 Dictionary
CHERUP
a corruption of chirp, which see.
Webster's 1913 Dictionary
CHERUP
Cher "up, v. i. Etym: [Prob. fr. chirp. ]
Defn: To make a short, shrill, cheerful sound; to chirp. See Chirrup. "Cheruping birds." Drayton.
CHERUP
CHERUP Cher "up, v. t.
Defn: To excite or urge on by making a short, shrill, cheerful sound; to cherup to. See Chirrup. He cherups brisk ear-erecting steed. Cowper.
CHERUP
CHERUP Cher "up, n.
Defn: A short, sharp, cheerful noise; a chirp; a chirrup; as, the cherup of a cricket.
The Wordsmith Dictionary