Definition: to make a solemn oath or commitment in regards to doing something
Part of Speech: Verb
Synonym(s): affirm, state under oath
Antonym(s): renounce, deny
1. On January 20, 2017, Chief Justice Roberts will swear in Donald J. Trump as the 45th President of the United States of America.
2. Do you swear to tell the truth as you testify during the trial?
3. When you join the military, you must swear an oath to your country.