noun, noun which may take the genitive case particle 'no'
one foot; one leg
Refers to a single foot or leg, often in contexts of balance, injury, or standing on one leg.
彼は片足で立っている。
He is standing on one leg.
片足をけがして歩けない。
I injured one leg and can't walk.
Only when written 片足
Used when referring to a single item from a pair, typically shoes or socks. Restricted to the 片足 spelling.
靴下の片足がどこかに行ってしまった。
One of my socks has gone missing.
両足 means 'both feet/legs', contrasting with 片足 which refers to a single foot or leg.
Compound of 片 (kata, 'one side') + 足 (ashi, 'foot/leg'). The reading かたあし is a straightforward combination of the kun'yomi readings.