To dissociate is to break apart from someone, such as an employee leaving a business or a spouse leaving a marriage.
Dissociate is the opposite of associate. It comes from the Latin dissociare, which means basically "to disunite." To dissociate is to stop associating with someone. If a relationship ends, the two people are dissociated from one another. When you see the word dissociate2020欧洲杯时间, think "break-up."