Longman Dictionary of Contemporary English homepage

imperil

 verb
     
im‧per‧il past tense and past participle imperilled, present participle imperilling British English, past tense and past participle imperiled, present participle imperiling American English [transitive] formal
to put something or someone in danger [= endanger]:
Tax increases now might imperil economic recovery.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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