WordNet sense 1 (a linear unit of length equal to 12 inches or a third of a yard):

ft

WordNet sense 2 (an army unit consisting of soldiers who fight on foot):

infantry

WordNet sense 3 ((prosody) a group of 2 or 3 syllables forming the basic unit of poetic rhythm):

metrical foot, metrical unit

WordNet sense 4 (the part of the leg of a human being below the ankle joint):

pes, human foot

WordNet sense 5 (lowest support of a structure):

base, foundation, groundwork, substructure, fundament, understructure

WordNet sense 6 (any of various organs of locomotion or attachment in invertebrates):

invertebrate foot

WordNet sense 7 (pay for something):

pick

WordNet sense 8 (the pedal extremity of vertebrates other than human beings):

animal foot

WordNet sense 9 (walk):

hoof, hoof it

WordNet sense 10 (add a column of numbers):

foot up