as good as gold
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(as) good as gold
1. Obedient and well-behaved. Sure, I'll baby-sit Cindy's kids tonight—they're as good as gold every time I watch them.
2. Authentic and legitimate. According to the curator, this painting is as good as gold.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
as good as goldextremely well-behaved.
Farlex Partner Idioms Dictionary © Farlex 2017