Meaning of “flabbergast” in the English Dictionary

"flabbergast" in British English

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flabbergastverb [ T often passive ]

uk /ˈflæb.ə.ɡɑːst/ us /ˈflæb.ɚ.ɡæst/ informal
flabbergasted
adjective uk /ˈflæb.ə.ɡɑː.stɪd/ us /ˈflæb.ɚ.ɡæs.tɪd/

When they announced her name, the winner just sat there, flabbergasted.

(Definition of “flabbergast” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)