flat-out
[flat-out]
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.
Origin of flat-out
First recorded in 1925–30
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for flat-out
Contemporary Examples of flat-out
The president came to believe Shamir misled him on the settlement issue, or flat-out lied to him.
His post-mortem that there is no red or blue America was tired and flat-out wrong.
Old Don said flat-out that he took the girl for both him and his son.
More vexing than the short-shrift mentions are the flat-out omissions.
By the time I finished doing this it had become a flat-out race.
College Application Guru Turned Author Lacy Crawford on ‘Early Decision’Lizzie Crocker
August 24, 2013
Historical Examples of flat-out
This caused some concern over his meager fuel supply since his plan called for some flat-out jetting later on.
Far from HomeJ.A. Taylor
He believed in the New Work, believed in it with every fiber of his being, but an undiverse portfolio was flat-out irresponsible.
MakersCory Doctorow