Narrows

At this point the sea narrows into a strait.

The river suddenly narrows at this point.

The valley narrows 500 feet ahead.

I'd say that narrows it down quite a bit.

That narrows things down.

That narrows it down.

This certainly narrows down my options.

The road narrows drastically there.

And then the forlorn and haunting howls echoed down the river narrows and into our ears from a mile away, and before we had a chance to look at each other in disbelief the dogs answered the pack joyously. "We're over here!" they seemed to say. "And we're over here!" the wolves howled back.