After some time all the fireflies within a given tree (or even larger area) will begin to flash simultaneously in a burst.

Two things flashed simultaneously across Curt's mind.

A red warning light flashed on the panel simultaneously with an impulse to Helva's internal monitors.

Three things flashed through Button's mind simultaneously.

Suddenly, the lights of the entire dorm began to simultaneously flash on and off like a weird beacon.

True colour LEDs flash simultaneously around the base when not under attack.

Unlike the common white strobes, these strobes are specified not to flash simultaneously.

Three thoughts flashed through her mind virtually simultaneously, spurring her into immediate action.

The spotlight at the door went out and simultaneously a picture flashed on it.

Several times, too, he saw the eyes of the Negroes turned upon him and once they flashed simultaneously toward the white girl.