The term slowly reduce can be summarized by the word 'ERODE, ' which has five letters. ERODE is a verb that means to gradually wear away or diminish something, usually through natural processes such as wind and water. It is often used to describe the gradual destruction of landforms such as mountains, cliffs, and beaches. In other contexts, it can also refer to the gradual weakening of something, such as a person's confidence or a relationship.