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to plump up
[phrase form: plump]
01
to make something fuller or fluffier by shaking or adjusting it
Examples
She decided to plump the pillow up before guests arrived.
Every morning, I plump my bed pillows up to make the bed look neat.
02
to gain weight or become fuller in physical appearance
Examples
He has plumped up a bit since we last met; he must be eating well.
The baby 's cheeks have plumped up over the last few weeks.
