How is “flat out” used?

In All the President's Men (1976), one line is: “No, we were never told flat-out, "Don't talk."”

Which movie is “flat out” from?

The clip at the top of this page is from All the President's Men (1976).

in a definite and direct way; completely; as fast or as hard as possible

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in a definite and direct way; completely
It's flat-out spoiling him.
No, we were never told flat-out, "Don't talk."
Oxford20% de las películas
as fast or as hard as possible

Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

No, we were never told flat-out, "Don't talk."

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