The term 'Lose Underpinnings' can be summarized by the word 'ERODE', which has five letters. ERODE means to gradually wear away or diminish, usually through the action of natural elements such as wind, water, or ice. This term is often used to describe the gradual destruction of landforms, such as mountains, hills, and cliffs. It can also refer to the gradual weakening of a person's beliefs or values over time.