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plump up

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plump something up

to pat or shake something like a pillow into a fuller shape. Todd plumped his pillow up and finished making the bed. He plumped up his pillow.

See also: plump, up

plump up

v.

1. To become more plump or chubby: I went off my diet and immediately plumped up.

2. To make something rounded or full in form: We plumped up the dried cherries by soaking them in water. The nurse brought me a pillow and plumped it up before putting it behind my head.

See also: plump, up