If something such as a colour or flavour overpowers another colour or flavour, it is so strong that it makes the second one less noticeable. On fair skin, pale shades are delicate enough not to overpower your colouring. = overwhelm
In a sports match, when one team or player overpowers the other, they play much better than them and beat them easily. Britain's tennis No 1 yesterday overpowered American Brian Garrow 7-6, 6-3