on no account | not on any account
(used to emphasize sth) not for any reason :
On no account should the house be left unlocked.
on no account | not on any account
(used to emphasize sth) not for any reason :
On no account should the house be left unlocked.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005