Shut in Anger is an expression used to describe a feeling of intense anger that is held inside and not expressed outwardly. It is often associated with feelings of frustration and helplessness. The term can be summarized as a state of being angry but unable to express it. The crossword solution for the term Shut in Anger is SLAM, which is a verb meaning to shut or close forcefully. This accurately describes the feeling of Shut in Anger, as it implies a forceful closure of emotions.