Funny-bone meaning

A point on the elbow where the ulnar nerve runs close to the surface and produces a sharp tingling sensation if knocked against the bone.
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A sense of humor.
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A place on the inner elbow where the ulnar nerve passes close to the surface: a sharp impact at this place causes a strange, tingling sensation in the arm.
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Inclination to laughter; (one's) risibilities.
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A point on the elbow where the ulnar nerve runs close to the surface and produces a sharp tingling sensation if knocked against the bone.
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(idiomatic) The ulnar nerve in the elbow, which, when hit, causes a tingly sensation. [from the 19th c.]

Ouch, I just hit my funny bone.

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(figuratively) One's sense of humor.
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