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Definition of telegraph
a system for transmitting messages from a distance along a wire, especially one creating signals by making and breaking an electrical connection:news came from the outside world by telegraph a device for transmitting messages by telegraph.
verb [with object]
send (someone) a message by telegraph:I must go and telegraph Mom send (a message) by telegraph:she would rush off to telegraph news to her magazine convey (an intentional or unconscious message), especially with facial expression or body language:a tiny movement of her arm telegraphed her intention to strike