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Phrase(s): *good as gold
Cliché very good. (Usually used to describe children. *Also: as ~.) • Mother: Thank you for taking care of Gretchen; I hope she hasn’t been too much trouble. Grandmother: Not at all; she’s been as good as gold. • We knew that Daddy would not read us a bedtime story unless we behaved, so we tried to be good as gold.
McGrawhill's American Idioms And Phrasal Verbs