v. 1 a (of a liquid) start to bubble up and turn into vapour on reaching a certain temperature. b (of a vessel) contain boiling liquid (kettle is boiling). 2 a bring to boilingpoint. b cook in boiling liquid. c subject to boiling water, e.g. to clean. 3 a move or seethe like boiling water. b be very angry. n. act or process of boiling; boilingpoint (on the boil; bring to the boil). o boil down
