knee-buckler

English

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Noun

knee-buckler (plural knee-bucklers)

1. (baseball, slang) A curveball (or occasionally a knuckleball) that fools the hitter, causing his or her knees to buckle (i.e. bend).
2. (slang) Anything so stunning as to have a weakening effect on a person.
   • 2008, Everett Stephenson Jr., Resolution, page 195:

     This guy is a sensitive and gentle, yet exciting sex partner, certainly not rough but always leading the dance. She could get weak, just anticipating him, a real knee buckler.

   • 2013, Erik Schubach, Music of the Soul, volume 1:

     “Hi, Jimmy!” His friends stared back and forth between him and myself with their mouths open. Bella smiled a patented knee buckler at him.