Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Language: Old French
Origin: Latin periculum

peril

 noun
     
per‧il
1 [uncountable] literary or formal great danger, especially of being harmed or killed
in peril
They put their own lives in peril to rescue their friends.
great/grave/serious peril
The economy is now in grave peril.
a voyage that was fraught with peril (=full of danger)
2 [countable usually plural] literary or formal a danger or problem in a particular activity or situation:
the perils posed by mountaineering
peril of
the perils of the sea
3

do something at your peril

used to say that what someone is intending to do is dangerous or could cause them problems:
Politicians ignore this issue at their peril.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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