WordReference Random House Learner's Dictionary of American English © 2015
weak•en /ˈwikən/USA pronunciation   v. 
  1. to (cause to) become weak or weaker: [no object]The animal weakened and eventually died.[+ object]A lack of resources will weaken our efforts.
weak•en•er, n. [countable]

WordReference Random House Unabridged Dictionary of American English © 2015
weak•en  (wēkən), 
  1. to make weak or weaker.
  2. Phonetics[Phonet.]to change (a speech sound) to an articulation requiring less effort, as from geminate to nongeminate or from stop to fricative.

  1. Phonetics, to become weak or weaker.
  • weak + -en1 1520–30
weaken•er, n. 
1, 3. enfeeble, debilitate, enervate, undermine, sap, exhaust, deplete, lessen, diminish, lower, reduce, impair, minimize, invalidate. 1, 3. strengthen.

Collins Concise English Dictionary © HarperCollins Publishers::

weaken /ˈwiːkən/ vb
  1. to become or cause to become weak or weaker

ˈweakener n

'weaken' also found in these entries:

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