The phrase ‘Preaching to the Coir’ means to commend an opinion to those who already accept it. It can be used to describe a situation where someone tries to convince you of something you already believe in.
Example of use: “You don’t need to tell me this project is important; you’re preaching to the choir.”
Go beyond correction.
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View more information: https://www.gingersoftware.com/content/phrases/preaching-to-the-choir/