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Phrase(s): boil something away
1. Lit. to boil a liquid until it is gone altogether. • She left the kettle on and boiled the water away. • Boil away some of that water. 2. Lit. to remove a volatile chemical from a solution by boiling. • Boil the alcohol away or the sauce will be ruined. • You should boil away some of the liquid.
McGrawhill's American Idioms And Phrasal Verbs