flat out

Adverb
  1. In a blunt direct manner (synset 400280953)
    "he spoke bluntly"; "he stated his opinion flat-out"; "he was criticized roundly"
    same as: bluffly, bluntly, brusquely, roundly
  2. At top speed (synset 400086743)
    "he ran flat out to catch the bus"; "he was off down the road like blue murder"
    same as: like blue murder

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