Definition of weak in the knees in English:

weak in the knees

phrase

  • Helpless with emotion.

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