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3. weak at the knees

weak at the knees

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weak at the knees

if someone goes weak at the knees, they feel as if they might fall down because they have a sudden strong emotion about something or someone The very thought of jumping out of an aircraft with a parachute made him go weak at the knees. He was so gorgeous, I felt weak at the knees every time he spoke to me.

See also: knee, weak