spraining

/S P R EY1 N IH0 NG/
verb
  1. 1

    To weaken, as a joint, ligament, or muscle, by sudden and excessive exertion, as by wrenching; to overstrain, or stretch injuriously, but without luxation

    to sprain one's ankle

Source: https://en.wiktionary.org/wiki/sprain, https://en.wiktionary.org/wiki/spraining