power couplenoun [ C ]
uk/ˈpaʊər ˌkʌp.əl//ˈpaʊ.ɚ ˌkʌp.əl/two people who are married to each other, or in a relationship with each other, and both have extremely successful careers, especially in politics or entertainment:
Hillary Clinton is part of the power couple that has dominated the Democratic party since the early 1990s.