It must have been a prearranged signal because his assistant came quickly.

He thrust his sword into the air in a prearranged signal.

This was the prearranged signal that Hans should start driving to the park.

And at a prearranged signal, Michael called me, at four one morning.

"We have a prearranged signal if we see anything in the car."

He waved his hand several times in a prearranged signal.

Do not worry, old friend, once the final phase of our plan is put into action, you will receive the prearranged signal.

Following a prearranged signal, she set her napkin aside and rose.

The prearranged signal with macdonald to show I was on my way back.

She heard their footsteps coming very close now, and it was time for her to give the prearranged signal.