踵

彼（かれ）の鞄（かばん）が重（おも）くて、更（さら）に悪（わる）いことには、片足（かたあし）のかかとにまめができてしまっていた。

His bag was heavy, and what was worse, one of his heels had got blistered.

あんなにかかとの高（たか）い靴（くつ）はいてたら、すぐに捻挫（ねんざ）しちゃうよな。

If I tried to wear shoes with heels that high, I'd sprain my ankle.