(noun) a painful injury to a joint caused by a sudden wrenching of its ligaments.
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Noun Definition 1
(verb) twist suddenly so as to sprain. Synonyms: twist, wrench, turn, wrick, rick. Examples: "Wrench one's ankle." "The wrestler twisted his shoulder." "The hikers sprained their ankles when they fell." "I turned my ankle and couldn't walk for several days."