flounder - definition and synonyms

verb [intransitive] 

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/ˈflaʊndə(r)/
present tense
I/you/we/theyflounder
he/she/itflounders
present participlefloundering
past tensefloundered
past participlefloundered
  1. 2
    to feel confused and not know what to say or do next

    Maureen floundered, trying to think of a response.