At one's peril

with risk or danger to one; at the hazard of.
- Shak.

See also: Peril

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The warning has dire consequences and is ignored at one's peril.
Advocates accurately point out that social media are a tool that is ignored at one's peril.
It's one thing to think in terms of passive recreational use, but one does so at one's peril.
All rulers can be arbitrary, but in the Arab world, if there is a strong consensus on a given issue, ignoring it entirely can be done only at one's peril.
The characteristic West African high life rhythms of King Sunny Ade and Fela Kuti (the Chief had drummed for Kuti) have a certain completeness one messes with at one's peril.
HE HAS only one throw of the dice this season, but Henry Cecil is enjoying something of a renaissance this year, and so one underestimates his Ribblesdale Stakes runner Novellara at one's peril.
To say more would be to tip the Allen hand, which one tips at one's peril.
YOU can insult peoples' wives, husbands and children but never their horses-one forgets the fact at one's peril.