FLATFOOT is validvalid

a foot condition [n FLATFEET] / to walk with a dragging gait [v FLATFOOTED, FLATFOOTING, FLATFOOTS]

67,432 of 196,601 in NWL2023·also valid in CSW24

to walk with a dragging gait [v -ED, -ING, -S] / a foot condition [n FLATFOOTS or FLATFEET]