The term 'YOU're Preaching to the Choir' is an idiom that means someone is expressing an opinion that is already shared by the people they are speaking to. The crossword solutions for this term are AMEN (4 letters), Iknow (5 letters), and Tellmeaboutit (13 letters). AMEN is a Hebrew word meaning 'so be it' or 'TRULY' and is often used as an expression of agreement. Iknow is a phrase used to express understanding or agreement. Tellmeaboutit is a phrase used to express agreement or understanding, often sarcastically.