on no account

on no account idiom
Also, not on any account. Under no circumstances, certainly not, as in On no account should you put a metal utensil in the microwave oven, or Dad said we can't go, not on any account. [Mid-1800s]

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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