Answer: telegraph

AnswerCrossword Clue
TELEGRAPHMake known in advance
TELEGRAPHSignal one's punches
TELEGRAPHMorse's child
TELEGRAPHDotted line?
TELEGRAPHWire
telegraphA system for transmitting messages from a distance along a wire, esp. one creating signals by making and breaking an electrical connection
telegraphA device for transmitting messages in such a way
telegraphto transmit by telegraph, a combination of apparatus for transmitting information to a distance
telegraphA system for the rapid transmission of messages by relayed visual signals