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good as one's word, as

Completely trustworthy, dependable, as in The boss said we could leave early on Friday and she was as good as her word. [Second half of 1500s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.