(had) best (do something)

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(had) best (do something)

It is a good idea or in one's best interest to do something. I'd best get to bed early tonight, since I have to be at the airport at 3:30 AM. You best call your mother before she hears about your pregnancy from someone else. If your paper is due in two hours, you'd best turn off the video games and get to work!
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Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

(had) best do something

ought to do something, had better do something. Mary had best learn to mind her manners. You best listen to what I say.
See also: best
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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