Dictionary.com

flat-out

[ flat-out ]
/ ˈflætˈaʊt /
Save This Word!

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.

QUIZZES

THINK YOU’VE GOT A HANDLE ON THIS US STATE NICKNAME QUIZ?

Did you ever collect all those state quarters? Put them to good use on this quiz about curious state monikers and the facts around them.
Question 1 of 8
Mississippi’s nickname comes from the magnificent trees that grow there. What is it?

Origin of flat-out

First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for flat-out

Idioms and Phrases with flat-out

flat out

1

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

2

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

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
Tired of Typos? Get Help Now!