Meaning of “swear sb in” in the English Dictionary

british dictionary

"swear sb in" in British English

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swear sb in

specialized
phrasal verb with swear uk /sweər/ us /swer/ verb swore, sworn

When someone is sworn in, they make a formal promise to be honest or loyal, either in a law court or when starting a new official job:

The next witness was sworn in.
Obama was sworn in as president.

(Definition of “swear sb in” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)