(1):
(v. i.) To fail; to become deficient.
(2):
(n.) Want or absence of something necessary for completeness or perfection; deficiency; - opposed to superfluity.
(3):
(n.) Failing; fault; imperfection, whether physical or moral; blemish; as, a defect in the ear or eye; a defect in timber or iron; a defect of memory or judgment.
(4):
(v. t.) To injure; to damage.