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swear someone in (as something)
to administer an oath to someone who then officially begins in office. The judge swore Alice in as street commissioner. The judge swore in Alice as the new director.
Administer a legal or official oath to, as in The new mayor will be sworn in tomorrow. [c. 1700]
To administer a legal or official oath to someone: The police department swore in 15 new officers. The Chief Justice will swear the new President in.