WordReference Random House Learner's Dictionary of American English © 2017
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 © 2017
weak•en  (wēkən),USA pronunciation v.t. 
  1. to make weak or weaker.
  2. Phoneticsto 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.
weaken•er, n. 
  • weak + -en1 1520–30
    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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