радикально измениться(о положении, ситуации; used to say that a situation has changed to the opposite of what it was before: The boot is on the other foot and he is the one asking for help this timeКГА)
поменяться местами(used to say that a situation has changed to the opposite of what it was before: The boot is on the other foot and he is the one asking for help this timeКГА)