The Collaborative International Dictionary of English v.0.48:
Emboil \Em*boil"\, v. i. To boil with anger; to effervesce. [Obs.] --Spenser. [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Emboil \Em*boil"\, v. t. To cause to boil with anger; to irritate; to chafe. [Obs.] --Spenser. [1913 Webster]