plump up

phrasal verb·1 sense·particle up

Meanings

1

Shake or pat cushions and pillows to make them rounder and more comfortable

Why “up”? More of something is higher. Quantity, intensity and speed all rise.

She plumped up the cushions before guests arrived.
She patted the cushions to make them rounder before guests arrived.
He plumped up the pillows on the sofa.
He patted the pillows to make them rounder on the sofa.

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She plumped up the cushions before guests arrived. What does it mean?

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