प्ल = originally
leg soft = sole

comments
क्ल is palm and प्ल is sole.
Interestingly by the time of Sanskrit - even the ancient most, this is lost. प्लुत - verb(प्ल) + that survived but leg became पद

क्ल : clothing, clutch, clap, greek κλείω, जर्मन क्लव,
प्ल : flat, greek πέλμα, , latin planta,