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Phrase(s): spew one’s guts (out)
1. Sl. to empty one’s stomach; to vomit. • Fred is spewing his guts out because of that lousy fish you served. • He’s spewing his guts because he has the flu. 2. Sl. to tell everything that one knows; to confess everything. (Underworld.) • Lefty was sitting there in the police station spewing his guts out about the bank job. • If he really is spewing his guts, the mob will cancel his Christmas.
McGrawhill's American Idioms And Phrasal Verbs