Flat Out
[adv] at top speed; "he ran flat out to catch the bus"; "he was off down the road like blue murder"
[adv] in a blunt direct manner; "he spoke bluntly"; "he stated his opinion flat-out"; "he was criticized roundly"
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a outrance, a toute outrance, absolute, absolutely, admitting no exception, all hollow, all out, all the way, all-out, apace, at full blast, at full drive, at full speed, at full throttle, beyond all bounds, beyond compare, beyond comparison, beyond measu