He pressed the button he'd been ordered to touch only in gravest emergency.

But The Shadow had come prepared for an even graver emergency.

The matter of the gravest emergency was a police checkup, and you never saw such a checking of passports.

"The next person who bothers me, it better be a grave national emergency!"

Once again, the court found that the Aids epidemic was such a grave medical emergency that the defendants were justified in their actions.

To act as a second line of defense in times of grave emergency.

He would have been accepted only in a grave emergency.

Dorian would only use the chamber-pot in the gravest emergency.

They have to travel at night, but only the gravest emergency will lure a bed monster from its lair even then.

Or maybe in this grave emergency, no one was monitoring them.