得胜 is a verb-object compound (离合词) meaning 'to win victory.' The verb 得 carries the action, and 胜 (victory) is the object. It can be separated: you can insert 了, 过, or a measure word between the two parts, e.g., 得了胜 ('won a victory'), 得过胜 ('have won victory'). It has a formal or literary feel, often used in military, competition, or sports contexts.