flat out meaning and definition

FLAT OUT adverb

Definition of flat out (adverb)

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