also: きゃくとう
noun
footbath; hot spring foot bath
A shallow bath, often at a hot spring resort, designed for soaking only the feet and lower legs.
旅館の入口に無料の足湯があった。
There was a free footbath at the entrance of the ryokan.
寒い日に足湯に浸かると、体全体が温まる。
Soaking in a footbath on a cold day warms up your whole body.
Compound of 足 (foot) and 湯 (hot water). The reading あしゆ is the standard kun'yomi combination; きゃくとう is an on'yomi reading for the alternate kanji 脚湯.