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.

So we'll go flat out and let's see how it goes.

From BBC • Apr. 30, 2026

Jacobson says they have computers now working flat out generating brackets for this year’s competition.

From MarketWatch • Mar. 18, 2026

When flat out, a maximum of 250kw, in what is known in F1 jargon as 'super-clipping'.

From BBC • Mar. 17, 2026

One academic asked me flat out, if I loved Iran so much, why was I badmouthing it?

From The Wall Street Journal • Feb. 27, 2026

Even flat out it would take me three days, perhaps four, to reach Abol Bridge and the campground.

From "A Walk in the Woods" by Bill Bryson