n. A triangular plate or piece of cloth inserted or attached, to protect, strengthen, or fill out some part of a thing; a gore.n. An angular piece of iron or a kind of bracket fastened in the angles of a structure to give strength or stiffness. An angular piece of iron inserted in a boiler, tank, etc., where it changes from a cylindrical to a square form, as at the junction of the barrel and fire-box of a locomotive. A triangular piece of cloth inserted in a garment to strengthen or enlarge some part.n. In heraldry, same as gore, 7.To make with a gusset; insert a gusset into, as a garment.n. In iron shipbuilding, a piece of plate of triangular form reinforcing on one side the junction of a part which meets another angularly, the gusset-plate being approximately normal to the line of the joint between the parts. See cut under bracket, 9 .