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Phrase(s): Waste not, want not.
Prov. Cliché If you do not waste anything, you will always have enough. • Always save the fabric scraps left over from your sewing projects; you can use them to make something else. Waste not, want not. • Sam never let his leftovers spoil in the refrigerator but made sure to eat them. "Waste not, want not," he said.
McGrawhill's American Idioms And Phrasal Verbs