- (transitive) To put into peril; to place in danger or cause a hazard.
- "Boating and fishing groups contend that the 130 [wind energy] towers would be a navigation hazard and offshore construction would imperil the fisheries." — "Wind Out of Their Sails", Jeffrey Winters, p. 31, Mechanical Engineering, June 2006
- (transitive) To risk.
- (put into peril): endanger
to put in peril