flat out

Idioms & Phrases

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® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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