Foot  —n. (pl. Feet) 1 a part of the leg below the ankle. B part of a sock etc. Covering this. 2 a lowest part of a page, stairs, etc. B end of a bed where the feet rest. C part of a chair, appliance, etc. On which it rests. 3 step, pace, or tread (fleet of foot). 4 (pl. Feet or foot) linear measure of 12 inches (30.48 cm). 5 metrical unit of verse forming part of a line. 6 hist. Infantry. —v. 1 pay (a bill). 2 (usu. As foot it) go or traverse on foot.  feet of clay fundamental weakness in a respected person. Have one's (or both) feet on the ground be practical. Have one foot in the grave be near death or very old. My foot! Int. Expressing strong contradiction. On foot walking. Put one's feet up colloq. Take a rest. Put one's foot down colloq. 1 insist firmly. 2 accelerate a vehicle. Put one's foot in it colloq. Make a tactless blunder. Under one's feet in the way. Under foot on the ground.  footless adj. [old english]