‘蹲踝’ is a verb meaning 'to sprain the ankle.' Despite its literal appearance—'squat' (蹲) plus 'ankle' (踝)—it does not describe the action of squatting; rather, it is a colloquial, regionally used compound that specifically refers to the injury resulting from twisting or rolling the ankle, often during physical activity. The character 蹲 here is a phonetic-semantic loan: it shares pronunciation with 损 (sǔn, 'to injure') in some dialects and has been adopted informally to evoke the sense of damage, while 踝 unambiguously denotes the ankle joint.

This term is commonly heard in spoken Mandarin, especially in informal medical contexts or casual conversation about sports injuries. It is not found in formal medical terminology (where 扭伤踝关节 or 踝关节扭伤 is standard), nor is it used in writing outside of dialogue or notes. Learners should recognize it as a fixed, idiomatic injury expression—not a compositional phrase—and avoid using it in formal reports or clinical settings.