Plump Plump, v. i. [Cf. D. plompen, G. plumpen, Sw. plumpa, Dan. plumpe. See {Plump}, a.] 1. To grow plump; to swell out; as, her cheeks have plumped. [1913 Webster]

2. To drop or fall suddenly or heavily, all at once.``Dulcissa plumps into a chair.'' --Spectator. [1913 Webster]

3. To {give} a plumper. See {Plumper}, 2. [1913 Webster]

The Collaborative International Dictionary of English. 2000.