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English definition of “flabbergast”

flabbergast

verb [T often passive]     /ˈflæb.ə.ɡɑːst/ US  /-ɚ.ɡæst/ informal
to shock someone, usually by telling them something they were not expecting: He was flabbergasted when we told him how cheap it was.Surprising and shockingMaking people sad, shocked and upset flabbergasted     /-ɡɑː.stɪd/ US  /-ɚ.ɡæs.tɪd/ adjective When they announced her name, the winner just sat there, flabbergasted.Surprised
(Definition of flabbergast verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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