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 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.

Other attacks against locke have boomeranged .

其他反对骆大使的攻击言论也不攻自破。

The plan boomeranged when they were trapped instead of their victim .

当他们而不是受害者陷于困境时这项计划伤及了原谋划者。

His plan to reduce the number of workers boomeranged on him .

他想要裁减工人的计划对他起了反作用。