Real Dictionary

telegraph
Telegraph is a system of sending messages over long distances, either by means of electricity or by radio signals. Telegraph was used more often before the invention of telephones and computers.
verb: If someone telegraphs something that they are planning or intending to do, they make it obvious, either deliberately or accidentally, that they are going to do it.
verb: In the past, to telegraph someone meant to send them a message by telegraph.

telegraph in American English
any signaling apparatus
to send (a message) by telegraph
to send a telegram
intransitive verb: to send a message by telegraph
noun: an apparatus, system, or process for transmitting messages or signals to a distant place, esp. by means of an electric device consisting essentially of a sending instrument and a distant receiving instrument connected by a conducting wire or other communi
transitive verb: to transmit or send (a message) by telegraph

telegraph in British English
noun: a device, system, or process by which information can be transmitted over a distance, esp using radio signals or coded electrical signals sent along a transmission line connected to a transmitting and a receiving instrument
verb: to send a telegram to (a person or place); wire