safety valve
relief valve
escape valve
escape cock
escape **

Insight, he said, "is almost like an outlet, an escape valve where they can come out with this information."

In some neighborhoods, choice has given desperate parents an escape valve from failing schools.

There is no easy escape valve in the new arrangement.

The hotels, administration officials said, provide an essential escape valve.

It has few of the escape valves that exist in London.

It is an escape valve for a booming Sunbelt city.

What we want to do is provide some type of escape valve.

From her mother she had learned that one must have an escape valve, one last card to play.

Although such measures can never be an alternative for good management, they must be an escape valve when something goes wrong.

Legal and illegal immigration are also very different escape valves.