What does it mean to be a hobo?

A hobo is a migrant worker or homeless vagrant, especially one who is impoverished. The term originated in the Western —probably Northwestern — United States around 1890. Unlike a " tramp ", who works only when forced to, and a " bum ", who does not work at all, a "hobo" is a traveling worker.

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e) none of the above answers are correct

so easy. just google the electromagnetic waves and it’ll pop up.