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fluff up

B1 neutral separable both
In simple words

Make something soft (like a pillow or feathers) bigger and fluffier by shaking or patting it.

Literal meaning: To shake something fluffy upward so it rises and expands — quite literal.

Meanings

1 A2 neutral

To shake or pat a pillow, cushion, or similar object to restore its soft, full shape.

"Before the guests arrived, she quickly fluffed up the sofa cushions."

Grammar: separable
2 B1 neutral

Of a bird or animal, to raise and spread feathers or fur to appear larger or to retain warmth.

"The cat fluffed up its tail when it spotted the dog across the garden."

Grammar: separable
3 B2 idiomatic informal

To make something seem more impressive, interesting, or substantial than it really is.

"He fluffed up his CV by exaggerating his responsibilities at his last job."

Grammar: separable
Usage notes

Very common in everyday domestic contexts — fluffing up pillows, cushions, or duvets. Also used for animals ruffling their feathers or fur. Occasionally used informally to mean making something more impressive or appealing.

Commonly used with

pillow cushion feathers fur hair duvet

Forms

Base
fluff up
I/you/we/they
3rd person
fluffs up
he/she/it
Past simple
fluffed up
yesterday
Past participle
fluffed up
have + pp
-ing form
fluffing up
continuous

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