Definition of weak in the knees in US English:

weak in the knees

phrase

  • Helpless with emotion.

    • ‘Almost every foodie I have ever met goes weak at the knees at the mere mention of white truffles.’
    • ‘Of course, I never met the lady in person - an experience that could apparently make strong men go weak at the knees.’
    • ‘His sun-kissed skin and stubble make the iciest of women weak at the knees.’
    faint, dizzy, light-headed, giddy, shaky
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