To grow plump; to swell out.

“Her cheeks have plumped.”

To make plump; to fill (out) or support; often with up.

“to plump oysters or scallops by placing them in fresh or brackish water”

To cast or let drop all at once, suddenly and heavily.

“to plump a stone into water”

Having a full and rounded shape; chubby, somewhat overweight.

“a plump baby; plump cheeks”

Fat.

Sudden and without reservation; blunt; direct; downright.