Refers specifically to the underside of the foot, from the toes to the heel.
A sole massage feels good.
My soles hurt after walking barefoot.
Standard kanji spelling for 'sole of the foot'.
Rare kanji form; not commonly used in modern Japanese.
Compound of 足 (foot) and 裏 (back, underside). The rare kanji 蹠 is a specific character for the sole of the foot.