Entry 2 senses · 2 variants Webster, 1913 Wapper · Wap·per · IPA v. t. & i. n. 01 v. t. & i. To cause to shake; to tremble; to move tremulously, as from weakness; to totter. 1. To cause to shake; to tremble; to move tremulously, as from weakness; to totter.[Obs.] 02 n. A gudgeon. 1. A gudgeon.(Zool.) [Prov. Eng.]