ankle (n.) Look up ankle at Dictionary.com
Old English ancleow "ankle," from PIE root *ang-/*ank- "to bend" (see angle (n.)). The modern form seems to have been influenced by Old Norse ökkla or Old Frisian ankel, which are immediately from the Proto-Germanic form of the root (cognates: Middle High German anke "joint," German Enke "ankle"); the second element in the Old English, Old Norse and Old Frisian forms perhaps suggests claw (compare Dutch anklaauw), or it may be from influence of cneow "knee," or it may be diminutive suffix -el. Middle English writers distinguished inner ankle projection (hel of the ancle) from the outer (utter or utward).