/ˈswɛrɪŋ ɪn/ – noun
Definition: Chứng thực, thề nguyện.
A more throughout explanation: 1. the action of making someone take an oath (=a promise that that a person will tell the truth) as a witness (=someone who tells a court what they know about something that has happened) in a court
2. the action of making someone take an oath (=a promise to act a certain way in the future) to act in an official capacity
Example: 1. The trial begins with the formal calling and swearing in of the witnesses to initiate the trial proceedings.
2. This is for the first time that heads of the states of Saarc nations have been invited to attend the swearing-in ceremony of the Prime Minister.