'Weaken' definitions:

Definition of 'weaken'

From: WordNet
verb
Lessen the strength of; "The fever weakened his body" [ant: beef up, fortify, strengthen]
verb
Become weaker; "The prisoner's resistance weakened after seven days" [ant: strengthen]
verb
Destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war" [syn: sabotage, undermine, countermine, counteract, subvert, weaken]
verb
Reduce the level or intensity or size or scope of; "de- escalate a crisis" [syn: de-escalate, weaken, step down] [ant: escalate, intensify, step up]
verb
Lessen in force or effect; "soften a shock"; "break a fall" [syn: dampen, damp, soften, weaken, break]

Definition of 'Weaken'

From: GCIDE
  • Weaken \Weak"en\, v. t. [imp. & p. p. Weakened; p. pr. & vb. n. Weakening.] [1913 Webster]
  • 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. [1913 Webster]
  • Their hands shall be weakened from the work, that it be not done. --Neh. vi. 9. [1913 Webster]
  • 2. To reduce in quality, strength, or spirit; as, to weaken tea; to weaken any solution or decoction. [1913 Webster]

Definition of 'Weaken'

From: GCIDE
  • Weaken \Weak"en\, v. i. To become weak or weaker; to lose strength, spirit, or determination; to become less positive or resolute; as, the patient weakened; the witness weakened on cross-examination. "His notion weakens, his discernings are lethargied." --Shak. [1913 Webster]

Synonyms of 'weaken'

From: Moby Thesaurus