blunder

Noun
  1. An embarrassing mistake (synset 100075610)
Verb
  1. Commit a faux pas or a fault or make a serious mistake (synset 202572142)
    "I blundered during the job interview"
  2. Make one's way clumsily or blindly (synset 202055471)
    "He fumbled towards the door"
  3. Utter impulsively (synset 200983976)
    "He blurted out the secret"; "He blundered his stupid ideas"

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