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English definition of “weaken”

weaken

verb [I or T]     /ˈwiː.kən/
C1 to ( cause to) become less strong , powerful , or determined : You could see the poor dog weakening daily as the disease spread through its body . Another defeat in parliament would seriously weaken the president's ability to govern . We know that prolonged exposure to vibration can weaken aircraft components . She's weakening - ask her some more questions and see if she confesses .Becoming and making less strong
(Definition of weaken verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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