1 [mass noun] 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
[count noun] a device for transmitting messages by telegraph.
2 (also telegraph board) a board displaying scores or other information at a sports match or race meeting.
send (someone) a message by telegraph:I must go and telegraph Mama
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 strikeI don’t own a wedding ring—this telegraphs a sad story