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louse up American English

Meaning: to spoil something or make it fail

For example:

  • She really wants this job, so I hope she doesn't louse up the interview.

  • Don't worry. He won't louse it up. He's been doing these deals for years.

Variety: This slang is typically used in American English but may be used in other varieties of English too.

Quick Quiz:

If Meg louses up this sale, she
  1. will get a promotion
  2. will get a bonus
  3. won't get a bonus

Discuss: louse up

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