Siding With is a phrase that means to take the side of someone or something, usually in a disagreement. The term can be broken down into three parts: FOR (3 letters), PRO (3 letters), and ALLYING (7 letters). FOR means to support or advocate FOR someone or something, PRO means in favor of, and ALLYING means to join forces with. Therefore, Siding With means to join forces with someone or something in order to support or advocate FOR them.