(1):

(n.) The lever at the end of which is the hammer head, in a forge hammer.

(2):

(n.) A forge hammer which is lifted by a cam acting on the helve between the fulcrum and the head.

(3):

(n.) The handle of an ax, hatchet, or adze.

(4):

(v. t.) To furnish with a helve, as an ax.