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set one's seal on

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Also, put one's seal on. Authorize, give one's approval to, as in We can go ahead as soon as the boss sets his seal on it. This idiom alludes to the old-time practice of affixing a seal on a document as a form of verification. It also began to be used more loosely in the early 1600s.

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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.

How to use set one's seal on in a sentence

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