what does the phrase "at your peril" mean?

Peril, as defined by the dictionary: risk of serious injury, destruction, disaster.
The state of being exposed to such risk at, or to one's peril, taking the risk and assuming the responsibility for the ill effects that are likely to result from in in period (rhet) in danger of losing, in period of one's life.

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"At your peril" means "at your death" realy. Peril comes from the word Perish... and i'm sure i dont have to define that one. Hope this answers your question!

the same as "at your own risk". whatever you're going to do is not advisable, so doing so would be at your risk only.

Peril Definition

Sound arguments here.

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Yo mamma is derived from the latin ~yo momma~ meaning your mother. It is significant in the fact that those that use the term are likely to have an IQ in the 65-85 quadrant.

It means that if you don't perform the desired action, you will be in trouble

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RE:
what does the phrase "at your peril" mean?

at your own risk

'at your own risk'; peril means danger, risk.

At your own risk

meaning you have to take responsibility yourself
Nobody is going to be liable for you

It means that if you do whatever is referred to, you risk finding yourself in big trouble or danger.