From BiblePortal Wikipedia

King James Dictionary [1]

PER'IL, n. L. periculum, from Gr. to try, to attempt, that is, to strain an attempt, danger, hazard to pass, to thrust in or transfix L. experior Eng. experience.

1. Danger risk hazard jeopardy particular exposure of person or property to injury,loss or destruction from any cause whatever.

In perils of waters in perils of robbers.  2 Corinthians 11

2. Danger denounced particular exposure You do it at your peril, or at the peril of your father's displeasure.

PER'IL, To be in danger. Not used.

Webster's Dictionary [2]

(1): ( n.) Danger; risk; hazard; jeopardy; exposure of person or property to injury, loss, or destruction.

(2): ( v. i.) To be in danger.

(3): ( v. t.) To expose to danger; to hazard; to risk; as, to peril one's life.

Vine's Expository Dictionary of NT Words [3]