plump up
Upper Intermediate (B2)neutral
To make a soft thing like a pillow or cushion bigger and puffier by hitting or shaking it
"She plumped up the pillows before the guests arrived to make the bedroom look inviting."
Hear it in context
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but you are going to plump up your skin.
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No wonder they had to plump up her face.
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bottles to plump up their lips like Kylie Jenner.