tried and true

tried and true idiom
Tested and proved to be worthy or reliable, as in Let me deal with it—my method is tried and true. [Mid-1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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