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Phrase(s): round off to something [and] round up to something; round down to something to express a number in the nearest whole amount or nearest group of 1, 10, 100, 1,000, 1/10, 1/100, 1/1,000, etc. • When doing taxes, Anne rounded her figures off to the nearest dollar. • These census population figures are rounded up to the nearest million.
McGrawhill's American Idioms And Phrasal Verbs