emboil means to boil with anger; to effervesce. Lexicurio rates it Sui generis — a strength score of 90 out of 100.
Etymology
From em- + boil.
verb
- To boil with anger; to effervesce.“quench thy hot emboiling Wrath”
- To cause to boil with anger; to irritate; to chafe.“Emboyled, grieued, brent.”