flatfoot, flat foot n. (Med.) A foot in which the arch of the instep is flattened so that the entire sole of the foot rests upon the ground; also, the deformity, usually congential, exhibited by such a foot; splayfoot.
... going to ask you a favor, Mable, for old times sake. Take the pictur I had taken pointin to the American flag an burn it up. You cant have that to show your friends no more an I aint goin to have no flat foot makin faces at it. I may be selfish, Mable, but a girl cant make a cake an eat it too as ... — Dere Mable - Love Letters Of A Rookie • Edward Streeter