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weaken

weaken - verb

  1. To lose strength or power: decline, degenerate, deteriorate, fade, fail, flag, languish, sink, wane, waste(away). Informal fizzle(out). See increase. strong.
  2. To lessen or deplete the nerve, energy, or strength of: attenuate, debilitate, devitalize, enervate, enfeeble, sap, undermine, undo, unnerve. See strong.
  3. To lessen the strength of by or as if by admixture: attenuate, cut, dilute, thin, water(down). See strong.
  4. To moderate or change a position or course of action as a result of pressure: ease off, relent, slacken, soften, yield. See strong.