/ ˈflʌməks; NAmE / verb
[ vn ] [ usually passive ] (not used in the progressive tenses) ( informal ) to confuse sb so that they do not know what to say or do :
I was flummoxed by her question.
► flum·moxed adjective
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WORD ORIGIN
mid 19th cent.: probably of dialect origin; flummock to make untidy, confuse is recorded in western counties and the north Midlands of England.