greasy feet
Refers to feet that are oily or greasy, often from sweat or natural skin oils. A straightforward compound of 脂 (grease) and 足 (feet).
In summer, my feet tend to get greasy.
Compound of 脂 (あぶら, 'grease, oil') and 足 (あし, 'feet'). The reading あし becomes あし in the compound due to rendaku.