flat-out

[ flat-out ]

/ ˈflætˈaʊt /

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adjective Informal.

moving or working at top speed or with maximum effort; all-out: a flat-out effort by all contestants.

downright; thoroughgoing: Many of the paintings were flat-out forgeries.

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Origin of flat-out

First recorded in 1925–30

Really, is it any wonder that fluoride should freak people out?
Anti-Fluoriders Are The OG Anti-Vaxxers|Michael Schulson|July 27, 2016|DAILY BEAST
For a while yoga and pilates classes were sought out at luxury gyms like Equinox.
How Taryn Toomey’s ‘The Class’ Became New York’s Latest Fitness Craze|Lizzie Crocker|January 9, 2015|DAILY BEAST
On Thursday, Garcetti ruled himself out of the race to succeed Boxer.
The Golden State Preps for the ‘Red Wedding’ of Senate Races|David Freedlander|January 9, 2015|DAILY BEAST
Police officials told the AP that they came out with guns blazing.
France Kills Charlie Hebdo Murderers|Nico Hines|January 9, 2015|DAILY BEAST

“I think for trans men who are dating every time they hook up they have another coming out,” Sandler said.
Grindr’s Trans Dating Problem|David Levesley|January 9, 2015|DAILY BEAST
And he was gone, and out of sight on the swift galloping Benito, before Father Gaspara bethought himself.
Ramona|Helen Hunt Jackson
Most of the men leaped up, caught hold of spears or knives, and rushed out.
The Giant of the North|R.M. Ballantyne
Liszt looked at it, and to her fright and dismay cried out in a fit of impatience, "No, I won't hear it!"
Music-Study in Germany|Amy Fay
The most High hath created medicines out of the earth, and a wise man will not abhor them.
The Bible, Douay-Rheims Version|Various
Squinty could look out, but the slats were as close together as those in a chicken coop, and the little pig could not get out.
Squinty the Comical Pig|Richard Barnum

flat out

In a direct manner, bluntly. For example, He told the true story flat out. [Colloquial; mid-1900s]

At top speed, as in She was running flat out to catch the train. [Slang; c. 1930]