damn well

damn well idiom
Also, damned well. Certainly, without doubt; emphatically. For example, You damn well better improve your grades, or I know damned well that he's leaving me out. The damn in this phrase is mainly an intensifier.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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