society > communication > indication > signalling > signal (something) [verb (transitive)] > signal to (a person) (3)
transitive. To instruct or direct (someone) to do something by means of gestures or signs; to make a signal to (a person, a ship, etc.). Frequently…
Now chiefly historical. transitive. To signal or send a message to (a person) by telegraph; (also) to summon by a telegram.
transitive. Chiefly Nautical. To make signals to; to communicate with by means of a signal or signals. Now rare.