The term 'undergoes' is a verb meaning to experience or endure something, often something unpleasant. It is composed of three letters: H-A-S. The word can be used in many contexts, such as when describing a person's emotional state or physical condition. For example, one might say that someone 'underwent a great deal of stress' or 'underwent surgery.' In either case, the person is experiencing something that is difficult or unpleasant.