Question 1

What does "louse up" mean?

Accepted Answer

To ruin or spoil something through error, carelessness, or incompetence.

Question 2

How do you use "louse up" in a sentence?

Accepted Answer

I completely loused up the presentation by forgetting half my notes.

Question 3

Is "louse up" formal or informal?

Accepted Answer

"louse up" is informal — used mainly in casual conversation. Primarily American English, and slightly dated compared to 'mess up' or 'screw up.' Still understood by most English speakers. Often used with personal responsibility: 'I really loused that up.'

louse up

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