plump up
To make a soft thing like a pillow or cushion bigger and puffier by hitting or shaking it
Meanings
To shake or squeeze a pillow or cushion so that it becomes full and rounded again
"She plumped up the pillows before the guests arrived to make the bedroom look inviting."
To become or make fuller and rounder in shape, especially referring to skin, cheeks, or lips
"After a few weeks of good food and rest, her cheeks had plumped up noticeably."
Most commonly used with pillows, cushions, and similar soft objects. Can also refer to lips looking fuller (in cosmetic contexts) or cheeks becoming plumper. Occasionally used for people or animals gaining healthy weight in an approving way.
Commonly used with
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