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3. set one's seal on

set one's seal on

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set one's seal on

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.

See also: on, seal, set