Wap"per (?), n. (Zoöl.) A gudgeon. [Prov. Eng.]
Wap"per (?), v. t. & i. [freq. of wap, v.; cf. dial. G. wappern, wippern, to move up and down, to rock.] To cause to shake; to tremble; to move tremulously, as from weakness; to totter. [Obs.]