Sentence:  When I was born, family and friends came from all over, thanks to the <WSD>bush telegraph</WSD>. There were very few telephones where I grew up, so my father mentioned my birth to someone at the market. And that woman told a man who was delivering rice to a place up the road. He told someone there, who was taking a herd of cattle south, toward the villages. And pretty soon the news of my birth had spread far and wide. 
Meaning of the word marked with <WSD> tags:  A system used by undeveloped societies in remote regions for communication over long distances, such as drum sounds, word-of-mouth relay, or smoke signals.