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at (one's) own peril

Done with the foreknowledge or forewarning that there is implied danger, especially of loss of life, which one must accept as one's own responsibility. Those who skydive do so at their own peril.
See also: own, peril

(do something) at your (own) ˈperil

(often used as a warning) at the risk of serious danger: People who go climbing in winter do so at their own peril.You go in Mike’s car at your peril. He’s a terrible driver.
See also: peril
References in classic literature ?
I must encounter the peril," answered Jason, composedly, "since it stands in the way of my purpose.
What it is I leave you to find out in the moment of peril.
And, ever since that time, it has been the favorite method of brave men, when danger assails them, to do what they call " taking the bull by the horns"; and to gripe him by the tail is pretty much the same thing--that is, to throw aside fear, and overcome the peril by despising it.
There was hardly a hope, or a possibility, that any young man who should undertake this voyage would either succeed in obtaining the Golden Fleece, or would survive to return home, and tell of the perils he had run.
They must have sturdy arms to row, and brave hearts to encounter perils, or we shall never win the Golden Fleece.
Have you come so far to seek it," exclaimed Medea, "and do you not recognize the meed of all your toils and perils, when it glitters before your eyes?
These, however, were not the worst of their difficulties and perils.
Not if I am putting you in peril of your life, ma'am," I answered, pertly enough, pointing to the paper in her hand.
As for the rest, the wages of those who were loyal were unceasing peril, torture, and death.
In fact, so terrible did we make ourselves, that it became a greater peril to betray us than to remain loyal to us.
Childhood in its simplicity knows nothing of the perils of life; youth sees both its vastness and its difficulties, and at the prospect the courage of youth sometimes flags.
The first of pleasures, that which at the outset comprehends all the others, is set about with such perils that it is impossible not to reflect upon the least actions which it provokes, impossible not to calculate all its consequences.
Miller, who seemed obstinately bent upon braving the perils of Mad River.
He endeavored, therefore, to dissuade him from this sudden resolution; representing its rashness, and the hardships and perils to which it would expose him.
Beware, oh, beware the perils of international arbitration