Entry 2 senses · 2 variants Webster, 1913 Emboil · Em·boil · IPA v. i. v. t. 01 v. i. To boil with anger; to effervesce. 1. To boil with anger; to effervesce.[Obs.] 02 v. t. To cause to boil with anger; to irritate; to chafe. 1. To cause to boil with anger; to irritate; to chafe.[Obs.]