heel: English has two separate words heel. The one that names the rear part of the foot [OE] comes ultimately from Germanic *khangkh-, which also produced English hock ‘quadruped’s joint corresponding to the human ankle’. From it was derived *khākhil-, source of Dutch hiel, Swedish häl, Danish hæl, and English heel. Heel ‘tilt, list’ [16] is probably descended from the Old English verb hieldan ‘incline’ (which survived dialectally into the 19th century), its -d mistaken as a past tense or past participle ending and removed to form a new infinitive. Hieldan itself came ultimately from the prehistoric Germanic adjective *khalthaz ‘inclined’. => hock[heel etymology, heel origin, 英语词源]