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Phrase(s): Cash is trash.
Prov. It is unwise to keep one’s investment money in cash. (Said when there are good opportunities in securities and it is foolish not to invest cash.) • If you’ve got money sitting around in savings while the market is steaming ahead, you are losing dollars. Right now cash is trash. • Cash is trash. Get into the market or you stand to lose a bundle.
McGrawhill's American Idioms And Phrasal Verbs