Meaning of “imperil” - Learner’s Dictionary

imperil

verb [ T ] uk us /ɪmˈperəl/ (present participle mainly UK imperilling, past tense and past participle imperilled, present participle US imperiling, past tense and past participle imperiled) formal

to put someone or something in a dangerous situation:

A police raid would imperil the lives of the hostages.

(Definition of “imperil” from the Cambridge Learner’s Dictionary © Cambridge University Press)