This was no doubt a smart call, given a grave future threat to port as we know it.

The result, the official says, is a grave threat to American security.

Another, graver threat goes to the heart of free expression.

But if it happens often, it's a grave threat to your well-being.

In this situation Charles felt that continuing the alliance was a grave threat to his personal position.

Population was indeed a very grave threat in the 1960s and 1970s.

There's a grave threat growing up around Wister and what are you doing about him?

And I don't hold it against him that he said grave threat.

Of course it is to be remembered here that we are concerned with a grave threat to the national economy.

Climate change is a grave threat indeed, and steps must be taken immediately.