signal for

signal for (someone or something)

1. To use some kind of indicator, especially a hand gesture, to signify that one wants or needs someone to come over to one. I signaled for Tom to come help us with the machine. Will you signal for the flight attendant? I think there's something wrong with the seat.
2. To use some kind of indicator to signify something that should or needs to be done. We built a massive bonfire on the beach of the deserted island to signal for help from any ships that might pass by. Janet signaled for another round of drinks to be brought to our table.
See also: signal

signal for someone

to make a sign for someone to come. I signaled for the waiter and got the check. Ted signaled for the parking lot attendant.
See also: signal

signal for something

to make a sign that something should be done. I caught the waiter's eye and signaled for the check. The director signaled for applause.
See also: signal
References in classic literature ?
By this time the signal for departure had been given, and the head of the English column was in motion.
In fact, after taking a few drops of wine and a piece of bread, Charles, weary of waiting for death, had suddenly decided to go to meet it and had given the signal for movement.
The transmitting device boosts the amplitude of the first part of the transition or cuts back the signal for the remainder of the transition.
The coach may also have a signal for pitchouts, and he can even factor in the location of the pitches.
With a multiplexed signal, the signal for apple and the signal for red could both carry a common signal, an encoded tag, so that the information could be recombined after being processed in different brain areas.