Thesaurus.com
Dictionary.com
Showing results for flat out. Search instead for flat-out/3.
Definitions

flat out

[flat-out] / ˈflætˈaʊt /
ADVERB
at top speed
Synonyms
WEAK
all out at full speed at full throttle bluntly directly full-bore openly peak performance wide open
flat-out
ADVERB
at top speed
Synonyms
WEAK
all the way all-out at a good clip for all one's worth full blast head over heels in full gallop lickety-split the whole nine yards to the max unrestrainedly wide open without reservation

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

F1 bosses are due to meet in the four-week gap between Japan and the next race in Miami to discuss changes to the rules to allow drivers to push flat-out in qualifying.

From BBC • Mar. 29, 2026

His accusation, Jones told Salon, is flat-out false.

From Salon • Mar. 11, 2026

At that awards show, when former Times columnist Amy Kaufman — then recently engaged herself — asked the “Dune” actor flat-out if she was engaged, Zendaya flashed her ring, smiled coyly and shrugged her shoulders.

From Los Angeles Times • Mar. 2, 2026

A 2016 consumer alert from the Federal Trade Commission, which appears to be the latest on the topic, warned people against this option, saying that the deals can be risky or “even flat-out scams.”

From MarketWatch • Feb. 4, 2026

I couldn’t tell if she was poking fun at me or flat-out handing me an insult.

From "The Detective's Assistant" by Kate Hannigan

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.