Rolling along the ground, Harry was doubly safe.

Then, to be doubly safe, they are obliged to hide their hands from him.

Still, Hortland was playing the thing doubly safe.

"And for that reason, we have to be doubly safe with this sort of thing," he said.

Since Three Mile Island, all of our plants have been made doubly safe.

I don't force my attentions on any woman, and you are doubly safe.

There was a chance, too, that the man had already used both barrels - in which case, The Shadow's course would prove doubly safe.

And, the moment your interview receives publicity, here or anywhere else, you would be, if still alive, doubly safe.

Doubly safe because if there were metal detectors at work they might be confused by the wing of the destroyed aircraft.

To make ourselves doubly safe, though, we went down the spiral ramp to the basement, where the crates were stacked even higher.