(perils)
1.
Perils are great dangers. (FORMAL)
...the perils of the sea...
We are in the gravest peril.
N-VAR: usu with supp
2.
The perils of a particular activity or course of action are the dangers or problems it may involve.
...the perils of starring in a television commercial.
N-PLURAL: with poss
3.
If you say that someone does something at their peril, you are warning them that they will probably suffer as a result of doing it.
Anyone who breaks the law does so at their peril.
PHRASE: PHR after v