The crossword solution for the term 'CHECKED, WITH 'IN'' is REINED, which is a six-letter word. The term 'reined' is used to describe the action of controlling or restraining something, usually with a rope or reins. It is often used in the context of horse riding, where the rider uses reins to control the horse. In other contexts, it can be used to describe the act of controlling or restraining someone or something else.