This was a prearranged code between them.

This was a prearranged code for gold bars.

He described a prearranged code in which the courier gave him the serial number of a dollar bill to make himself known.

What she said and did not say fit the prearranged code; Koutsoudas would remove the block he'd put on communications out of the cruiser.

He found a bulkhead intercom and called sickbay, using the prearranged code just in case anyone else was listening.

He gave the prearranged code so China would believe that Sean and his party had crossed the border.

But if the replies were in a prearranged code, nobody would be able to interpret them or know for whom they were intended.

This must have been the prearranged code with the auctioneer.

He undertook to blink the ship's running lights in a prearranged code.

The version used by adventurers can send 10 different signals and, with prearranged codes, alert a support team to changing conditions.