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Phrase(s): the greatest thing since indoor plumbing [and] the greatest thing since sliced bread
Rur. the most wonderful invention or useful item in a long time. • As far as I’m concerned, this new food processor is the greatest thing since indoor plumbing. • Joe thinks Sally is the greatest thing since sliced bread. You can tell just by the way he looks at her.
McGrawhill's American Idioms And Phrasal Verbs