\Cher"up\, v. i. [Prob. fr. chirp.]
To make a short, shrill, cheerful sound; to chirp. See
{Chirrup}. ``Cheruping birds.'' --Drayton.

\Cher"up\, v. t.
To excite or urge on by making a short, shrill, cheerful
sound; to cherup to. See {Chirrup}.
      He cherups brisk ear-erecting steed.     --Cowper.

\Cher"up\, n.
A short, sharp, cheerful noise; a chirp; a chirrup; as, the
cherup of a cricket.