at one's peril

idiom

Definition of at one's peril

somewhat formal
used to say that if one does something there could be bad consequencesRestaurants that ignore the smoking ban do so at their peril.

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“At one's peril.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/at%20one%27s%20peril. Accessed 9 Aug. 2020.

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