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Weak at the knees

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LampPro Tip 1/3
Emotional OverwhelmPlay
Use it to describe strong emotions that impact one's physical state, not just any feeling. SlideSeeing the Grand Canyon for the first time, I instantly went weak at the knees.
LampPro Tip 2/3
Non-literal UsePlay
It's a figurative expression; your knees might not actually feel weak. SlideDuring the intense horror movie, I felt weak at the knees even sitting down.
LampPro Tip 3/3
Intensity MarkerPlay
Shows an extreme reaction, more than being just nervous or excited. SlideHearing my song on the radio made me go weak at the knees with excitement.