power grab

noun
🔊/ˈpaʊə ɡræb/
🔊/ˈpaʊər ɡræb/
(informal)
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  1. an attempt by a person or group to take more authority for themselves, usually by taking it from another person or group
    • He was criticized for making what many saw as an undemocratic power grab.批评他使许多人认为是不民主的权力抢夺。