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ankle jerk

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noun

a reflex extension of the foot, caused by contraction of the muscles of the calf, resulting from a sharp tap on the Achilles tendon.

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Also called Achilles reflex, Achilles' reflex .

Origin of ankle jerk

First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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