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flat-out

[flat-out]
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adjective Informal.
  1. moving or working at top speed or with maximum effort; all-out: a flat-out effort by all contestants.
  2. downright; thoroughgoing: Many of the paintings were flat-out forgeries.
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Origin of flat-out

First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for flat-out

Contemporary Examples

Historical Examples

  • This caused some concern over his meager fuel supply since his plan called for some flat-out jetting later on.

    Far from Home

    J.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.

    Makers

    Cory Doctorow