flat out Meaning, Definition & Usage

  1. adverb in a blunt direct manner
    brusquely; bluffly; roundly; bluntly.
    • he spoke bluntly
    • he stated his opinion flat-out
    • he was criticized roundly
  2. adverb at top speed
    like blue murder.
    • he ran flat out to catch the bus
    • he was off down the road like blue murder

WordNet