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English definition of “weaken”

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weaken

verb [I or T] uk   /ˈwiː.kən/ us  
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.
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(Definition of weaken from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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