Weaken \Weak"en\, v. t. [imp. & p. p. Weakened; p. pr. & vb. n. Weakening.]

1. To make weak; to lessen the strength of; to deprive of strength; to debilitate; to enfeeble; to enervate; as, to weaken the body or the mind; to weaken the hands of a magistrate; to weaken the force of an objection or an argument.

Their hands shall be weakened from the work, that it be not done. --Neh. vi. 9.

2. To reduce in quality, strength, or spirit; as, to weaken tea; to weaken any solution or decoction.

Source: Webster's Revised Unabridged Dictionary (1913)