1. putting someone or something in danger or at risk of harm
Usage: present participle of imperil; British spelling

Examples

• The storm was imperilling the safety of all passengers on board.
• His reckless driving was imperilling the lives of other motorists.
• The company’s poor decisions were imperilling its future success.
• Climate change is imperilling many species around the world.
• The leak was imperilling the security of classified information.
• Her illness was imperilling her chances of graduating on time.