Definition: to make someone promise to do their duty truthfully either at the beginning of a trial in a court of law or at the beginning of a new official appointment.
The jury was selected and sworn in on Monday and the trial started on Tuesday.
The court often swears the jury in the day before the start.
The new president will be sworn in next week.
I was sworn in as Public Translator in the year 2000.
My group of public translators was sworn in in the year 2000.