One of the mysteries of the English language finally explained.
1The action of shaking or nodding one's head violently, vigorously, or involuntarily, especially as the result of a medical condition.
2The action of shaking one's head slightly from side to side as an expression of disapproval, disagreement, sorrow, etc.; an instance of this. Hence: feeling or reaction of this type; disapproval, negativity, etc. Compare to shake one's head.
3Zoology. With reference to an animal: the ritualized or instinctive action shaking the head, especially as a mutual courtship or greeting display by a pair of birds.
Late 16th century. From head + shaking.
head shaking/ˈhɛd ˌʃeɪkɪŋ/
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