trip (action of tripping someone)

full-length, en pied

when standing in a body of water, to be able to touch the bottom with one's feet and still have one's head above water

to heel!

footstool

(derogatory) a person with a clubfoot, a club-footed person

(medicine) flatfoot

Greek foot (a foot with a second toe longer than the hallux)

single-storey building / same-level apartment / one-floor residence / ground floor

to get out of one's depth (to get in a body of water too deep for one to be able to touch the bottom)