on no account

on no account

For no reason or incentive; not for anything. On no account will I agree to sign this deal. It is an insult to me and my family! You must on no account give your banking details to anyone over the phone or by email.
See also: account, no, on
Farlex Dictionary of Idioms.

on no account

 and not on any account
for no reason; absolutely not. On no account will I lend you the money. Will I say I'm sorry? Not on any account.
See also: account, no, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

on no account

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]
See also: account, no, on
The American Heritage® Dictionary of Idioms by Christine Ammer.

on ˈno account

,

not on ˈany account

not for any reason: On no account (should you) try to fix the heater yourself. All repairs should be done by a trained engineer.
See also: account, no, on
Farlex Partner Idioms Dictionary

on no account

Under no circumstances.
See also: account, no, on
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • not for any account
  • give an account of (someone or something) to (someone)
  • account to (one)
  • charge (something) (up) to (something)
  • charge up to
  • give an account to (someone)
  • give an account
  • give an account of (someone or something)
  • on account of (someone or something)
  • on account of somebody/something