Англо-русский словарь Мюллера
buy back выкупать He changed his mind about moving, but was unable to buythe house back.
Большой англо-русский и русско-английский словарь
выкупать He changed his mind about moving, but was unable to buy the house back. ≈ Он передумал переезжать, но выкупить свой старый дом не смог.