(1):

(v. t.) To loosen the string or strings of; as, to unstring a harp or a bow.

(2):

(v. t.) To relax the tension of; to loosen.

(3):

(v. t.) Used also figuratively; as, his nerves were unstrung by fear.

(4):

(v. t.) To deprive of a string or strings; also, to take from a string; as, to unstring beads.