Using their patents to keep rivals out of the market is like putting rocks in a stream.

To keep rivals from getting to the body first, they switched headstones.

And Random House especially wanted to keep rivals from making deals with its authors.

All in all, the confusion has helped keep rivals off balance.

This was one of the methods used by the Tokugawa to keep potential rivals in check.

At the same time, they, like the others, have been develop new products, to keep their companies growing - and rivals at bay.

But their determination to keep Western rivals at bay could be counter-productive.

Plaintiffs counter that they keep rivals from having a fair shot.

Airlines have discovered ingenious ways to keep rivals off their turf.

A series of compromise candidates nominated by the national governments as thanks for services rendered or, quite simply, to keep rivals at bay.