带伤 is a separable verb (离合词) composed of 带 ('to carry/have') and 伤 ('injury'). It means 'to be injured' or 'to have an injury,' often while continuing an activity (e.g., 带伤工作 'work while injured'). When tense markers (了, 过) or other elements are inserted, the two characters split: for example, 带了三次伤 ('got injured three times') or 带着很重的伤 ('carrying a serious injury'). The object 伤 can also take attributes.