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Definition of weaken:

  1. 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.
  2. 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.
  3. To reduce in quality, strength, or spirit; as, to weaken tea; to weaken any solution or decoction.


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