The word "preach" refers to the act of delivering a religious or moral message, usually in a formal setting, such as a church. It can also mean to advocate or promote a particular set of beliefs or principles to others. When someone preaches, they typically aim to instruct, inspire, or persuade their audience regarding a specific doctrine or ethical guideline.
The word "preach" comes from the Old French "preacher," which is derived from the Latin "praedicare," meaning "to make known publicly" or "to declare." The Latin word is composed of "prae-" (before) and "dicare" (to proclaim).