under no circumstances


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under no circumstances

At no time; never. Under no circumstances will I allow you to go to a party on a school night.
See also: circumstance, no
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

under no circumstances

 and not under any circumstances
Fig. absolutely never. Andy: Under no circumstances will I ever go back there again! Rachel: Why? What happened? Sue: Can I talk you into serving as a referee again? Mary: Heavens, no! Not under any circumstances!
See also: circumstance, no
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

in/under no circumstances

used to emphasize that something should never happen or be allowed: Under no circumstances should you lend Paul any money.Don’t open the door to strangers in any circumstances.
See also: circumstance, no
Farlex Partner Idioms Dictionary © Farlex 2017

under

/in the circumstances
Given these conditions; such being the case.

under no circumstances

In no case; never.
See also: circumstance, no
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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