Medical Definition of ankle jerk
: a reflex downward movement of the foot produced by a spasmodic contraction of the muscles of the calf in response to sudden extension of the leg or the striking of the Achilles tendon above the heel
— called also Achilles reflex
Test Your Vocabulary
More Confusing Words—Quiz
-
- The magician
______
moved the selected card to the top of the deck.

Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Spell words. Make bears.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Share ankle jerk