"Break faith" is a phrase that refers to the act of betraying someone's trust or breaking a promise. Some common synonyms for "break faith" include "betray," "deceive," "mislead," "fail," and "disappoint." "Betray" means to be disloyal or unfaithful to someone who trusts you. "Deceive" and "mislead" involve giving false information or leading someone to believe something that is not true. "Fail" refers to not meeting expectations or not doing what was promised. Finally, "disappoint" is when someone fails to meet someone's hopes or expectations. All of these words describe the act of breaking faith in different ways.