Plump, v. t. [imp. & p. p. Plumped (?); p. pr. & vb. n. Plumping.] 1.
To make plump; to fill (out) or support; -- often with up.
To plump up the hollowness of their history with improbable
miracles.
Fuller.
2. To cast or let drop all at once, suddenly and heavily; as, to plump
a stone into water.