One of the mysteries of the English language finally explained.
1An act or instance of shaking the head, especially as used to express disapproval, a negative response to a question, etc. Compare to shake one's head.
2A ritualized or instinctive act of shaking the head on the part of an animal, especially as part of the mutual courtship or greeting display of a pair of birds.
Early 17th century; earliest use found in William Shakespeare (1564–1616), playwright and poet. From head + shake.
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