role reversal

1. N-VAR Role reversal is a situation in which two people have chosen or been forced to exchange their duties and responsibilities, so that each is now doing what the other used to do. 角色互换; 角色对调

...men who have undertaken the most extreme role reversal and become house husbands. ...那些进行了最极端的角色对调而成为家庭主夫的男人。