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stuff up

B1 informal separable both
In simple words

Make a big mistake and ruin something, OR push something into a space to block it up.

Literal meaning: To stuff (push material) up into a space — filling a gap from below.

Meanings

1 B1 idiomatic informal

(Australian/NZ informal) To make a serious mistake; to ruin or spoil something through error.

"I totally stuffed up the presentation — I forgot to bring the slides."

Grammar: separable
2 B1 neutral

To fill a gap, hole, or cavity by pushing material firmly into it.

"She stuffed up the crack in the wall with old newspaper to keep out the draught."

Grammar: separable
3 A2 informal

To block a passage in the body (especially the nose), making it difficult to breathe.

"My nose is stuffed up from this cold and I can barely sleep."

Grammar: separable
Usage notes

The 'make a mistake' sense is predominantly Australian and New Zealand English, equivalent to 'mess up' or 'screw up' in American English. The physical sense (filling a gap) is used more broadly. The mistake sense can also be used as a noun: 'a stuff-up'.

Commonly used with

presentation interview exam job hole draft

Forms

Base
stuff up
I/you/we/they
3rd person
stuffs up
he/she/it
Past simple
stuffed up
yesterday
Past participle
stuffed up
have + pp
-ing form
stuffing up
continuous

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