plump

1. (intransitive) To grow plump; to swell out.Examples: "Her cheeks have plumped."

2. (transitive) To make plump; to fill (out) or support; often with up.Examples: "to plump oysters or scallops by placing them in fresh or brackish water"; "to plump up the hollowness of their history with improbable miracles"; "Although Miss Pross, through her long association with a French family, might have known as much of their language as of her own, if she had had a mind, she had no mind in that direction […] So her manner of marketing was to plump a noun-substantive at the head of a shopkeeper without any introduction in the nature of an article […]"

3. (intransitive) To give a plumper (kind of vote).

4. (transitive) To give (a vote), as a plumper.

5. (intransitive) To favor or decide in favor of. [with for ‘something’]Examples: "A recent poll by the New York Times found that although most Brazilians plump for arch-rival Argentina as the team they most want to lose, the second-biggest group want Brazil itself to stumble."