Companies may offer as evidence of their right to reduce benefits the fact that previous reductions have gone unchallenged.

Spain's control of the islands did not go completely unchallenged.

We may even be the prisoners of attitudes that have long gone unchallenged.

But even today, the challengers do not go entirely unchallenged.

For centuries, the rule of thinking machines had gone unchallenged.

His escape had therefore not only gone unchallenged, but unseen.

Big vested interests like the energy companies have gone unchallenged, while you're being ripped off.

It should be pointed out, however, that Sargent's empirical results have not gone unchallenged.

The power of the throne, however, has not gone unchallenged.

But the hiring practices in small cities and towns have gone largely unchallenged.