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Phrase(s): *sound as a dollar
1. Cliché very secure and dependable. (*Also: as ~.) • This investment is as sound as a dollar. • I wouldn’t put my money in a bank that isn’t sound as a dollar. 2. Cliché sturdy and well-constructed. (*Also: as ~.) • This house is as sound as a dollar. • The garage is still sound as a dollar. Why tear it down?
McGrawhill's American Idioms And Phrasal Verbs