'蹲了' (cūn le) is a colloquial verb phrase meaning 'has sprained (a joint)'—most commonly the ankle or knee. Though the character 蹲 normally means 'to squat', in this fixed, idiomatic usage it has shifted semantically to refer specifically to a twisting injury sustained during sudden movement, often while walking, running, or stepping awkwardly. The particle 了 indicates completion of the action and resulting state, so '蹲了' emphasizes that the sprain has already occurred and its effects are now present.

This expression is informal and widely used in spoken Mandarin, especially in everyday health-related conversations—like describing minor sports injuries, household accidents, or post-fall complaints. It's not used for serious fractures or chronic conditions; rather, it conveys a mild-to-moderate acute soft-tissue injury. Note that the pronunciation here is cūn (first tone), not cún (second tone)—a common mispronunciation learners should avoid.