Entry 1 sense Webster, 1913 Imperil /ĭmˌ-pĕr'-əl/ · Im·per·il · IPA /ɪmˈpɛɹəl/ 01 v. t. To bring into peril; to endanger. imp. & p. p. Imperiled; p. pr. & vb. n. Imperiling 1. To bring into peril; to endanger.