As a noun:
* The old man received a telegram from his son, delivered by a boy on a bicycle.
* They sent a coded message by telegraph to warn the others of the approaching danger.
* The telegraph played a vital role in transmitting news during the Civil War.
As a verb:
* He telegraphed his love to her by sending her a bouquet of flowers.
* The captain telegraphed his orders to the ship's crew.
* Using a series of dots and dashes, the operator telegraphed a message across the ocean.
In a figurative sense:
* Her eyes telegraphed her anxiety, even though she tried to appear calm.
* The painting telegraphed a sense of quiet melancholy.
* The politician's words telegraphed his intentions, even though he tried to be subtle.
The best way to use "telegraph" will depend on the context of your sentence.