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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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ARE YOU A TRUE BLUE CHAMPION OF THESE "BLUE" SYNONYMS?
We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms.
Question 1 of 8
Which of the following words describes “sky blue”?
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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.

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