His attempt to discredit his opponent boomeranged when he was charged with libel.

他企图败坏对手名声反而自食其果,被控以诽谤罪.

His attempt to discredit his opponent boomeranged (on him) when he was charged with libel.

他企图败坏对手名声反而自食其果,被控以诽谤罪.

His attempt to discredit his opponent boomeranged ( on him ) when he was charged with libel.

他企图败坏对手名声反而自食其果,被控以诽谤罪.