- to become or cause to become weak or weaker
WordReference Random House Learner's Dictionary of American English © 2014
weak•en /ˈwikən/USA pronunciation v.
to (cause to) become weak or weaker: [no object]The animal weakened and eventually died.[~ + object]A lack of resources will weaken our efforts.
Collins Concise English Dictionary © HarperCollins Publishers::
weaken /ˈwiːkən/ vb
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