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English definition of “frustrate”

frustrate

verb [T] uk   /frʌsˈtreɪt/ us    /ˈfrʌs.treɪt/

frustrate verb [T] (DISCOURAGE)

to make someone feel annoyed or less confident because they cannot achieve what they want: It frustrates me that I'm not able to put any of my ideas into practice.Making people sad, shocked and upset

frustrate verb [T] (PREVENT)

to prevent the plans or efforts of someone or something from being achieved: The continuing civil war is frustrating the efforts of relief agencies.Preventing and impedingLimiting and restricting
(Definition of frustrate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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