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weak at the knees

Meaning: If you go weak at the knees, you feel an emotion so strongly that it makes you feel unstable on your feet.

For example:

  • When he looked at me and smiled, I felt weak at the knees. He was the most beautiful man I'd ever seen!

  • Just thinking about getting up in front of a thousand people makes me weak at the knees. It's terrifying!

Quick Quiz:

Carlos gasped and went weak at the knees when he realised he had
  1. put a little bit too much sugar in his tea
  2. forgotten to tie one of his shoelaces
  3. lost his passport, money and credit cards

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