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This becomes a bone spur. When the bone spur grows out of one of the joints on the top of the midfoot, it's called a tarsal boss. A bone spur on the inside or outside any of the toes is usually referred to as a toe spur. Any factor that creates too much friction within the foot can lead to a tarsal boss or toe spur.
Noun[edit] boss â(plural bosses) 1  A swelling, lump or protuberance in an animal, person or object. ( 2 geology) A lump-like mass of rock, especially one projecting through a stratum of different rock.  A convex protuberance in hammered work, especially the rounded projection in the centre of a shield.