WordNet (r) 3.0 (2006):
flat out adv 1: in a blunt direct manner; "he spoke bluntly"; "he stated his opinion flat-out"; "he was criticized roundly" [syn: bluffly, bluntly, brusquely, flat out, roundly] 2: at top speed; "he ran flat out to catch the bus"; "he was off down the road like blue murder" [syn: flat out, like blue murder]