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Longman Dictionary of Contemporary English
funny bone
noun
EXAMPLES FROM CORPUS
▪ Chasing him, she banged her funny bone on the doorpost.
▪ The function of the funny bone is to make you cry.
The Collaborative International Dictionary
funny bone

Crazy \Cra"zy\ (kr[=a]"z[y^]), a. [From Craze.]

  1. Characterized by weakness or feebleness; decrepit; broken; falling to decay; shaky; unsafe.

    Piles of mean andcrazy houses.
    --Macaulay.

    One of great riches, but a crazy constitution.
    --Addison.

    They . . . got a crazy boat to carry them to the island.
    --Jeffrey.

  2. Broken, weakened, or dissordered in intellect; shattered; demented; deranged.

    Over moist and crazy brains.
    --Hudibras.

  3. Inordinately desirous; foolishly eager. [Colloq.]

    The girls were crazy to be introduced to him.
    --R. B. Kimball.

    Crazy bone, the bony projection at the end of the elbow (olecranon), behind which passes the ulnar nerve; -- so called on account of the curiously painful tingling felt, when, in a particular position, it receives a blow; -- called also funny bone.

    Crazy quilt, a bedquilt made of pieces of silk or other material of various sizes, shapes, and colors, fancifully stitched together without definite plan or arrangement.

Wiktionary
funny bone

n. 1 (context idiomatic English) The ulnar nerve in the elbow, which, when hit, causes a tingly sensation. (from the 19th c.) 2 (context figuratively English) One's sense of humor.

WordNet
funny bone

n. a point on the elbow where the ulnar nerve passes near the surface; a sharp tingling sensation results when the nerve is knocked against the bone; "the funny bone is not humerus" [syn: crazy bone]

Usage examples of "funny bone".

She'd looked so different, with her bulging forehead and the funny bone beneath her mouth that Jondalar said was a chin, she always thought of herself as big and ugly.

That's why it surprised him when I jammed his fist against his own chest, then smacked the gun in my left hand against his funny bone.

He may not be much of a poet, but he knows how to hit the funny bone.

I reminded myself not to laugh too loudly if Miss Zora said something that tickled my funny bone.

Bleary from too many lemonades, she collided with a sharp corner of the bed, cracked her funny bone on the toaster, and just seconds ago, almost bumped into the car in front of her as her attention wandered all over the interstate.

I popped him in the funny bone with the dull end of the pick head.

It sounds as if Speero the Heero has just kicked ass, though, and the color of his language -- magniloquent mauve -- seems to've tickled everybody's funny bone.