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Definition

peril noun

/ˈper.əl/ n [C or U] formal
great danger, or something that is very dangerous
I never felt that my life was in peril.
The journey through the mountains was fraught with peril (= full of dangers).
Teenagers must be warned about the perils of unsafe sex.

do sth at your peril

to do something that might be very dangerous for you
We underestimate the destructiveness of war at our peril.

(Definition of peril noun from the Cambridge Advanced Learner's Dictionary)

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