flat-out

adjective \ ˈflat-ˌau̇t \

Definition of flat-out

1 :being or going at maximum effort or speed
2 :out-and-out, downright
  • it was a flat-out lie

First Known Use of flat-out

1906


flat out

adverb

Definition of flat out

1 :in a blunt and direct manner :openly
  • called flat out for revolution
  • Nat'l Review
2 :at top speed or peak performance
  • the car does 180 m.p.h. flat out
3 usually flat-out play \ˈflat-ˌau̇t\ :absolutely, downright usually used as an intensive
  • is just flat-out confusing

Examples of flat out in a Sentence

  1. I told him flat out that I have no intention of marrying him.

  2. We asked for more time but they refused us flat out.

  3. The car does 180 mph flat out.

First Known Use of flat out

1932


FLAT-OUT Defined for English Language Learners

flat-out

adjective

Definition of flat-out for English Language Learners

  • : absolute and complete

  • : greatest possible


flat out

adverb

Definition of flat out for English Language Learners

  • : in a very clear and direct way

  • : at the fastest possible speed

  • —used to make a statement more forceful


FLAT-OUT Defined for Kids

flat-out

adjective \ ˈflat-ˌau̇t \

Definition of flat-out for Students

1 :2out-right 1
  • That's a flat-out lie.
  • —Phyllis Reynolds Naylor, Shiloh
2 :greatest possible
  • a flat-out effort

flat out

adverb

Definition of flat out for Students

1 :in a very clear manner
  • I told him flat out to leave.
2 :at top speed
  • We worked flat out to finish.


Seen and Heard

What made you want to look up flat-out? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

serious difficulty or misfortune

Get Word of the Day daily email!

Test Your Vocabulary

The Exceptions Quiz III

  • one-green-toy-robot-amidst-many-red-toy-robots
  • Which of these words does not mean "nonsense"?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!