blunder - definition and synonyms

verb [intransitive] 

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/ˈblʌndə(r)/
present tense
I/you/we/theyblunder
he/she/itblunders
present participleblundering
past tenseblundered
past participleblundered
  1. 2
    to move or progress in a careless way, making mistakes or creating problems as you go
    blunder about/around/into:

    Someone was blundering about in the darkness.