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Definition of Boundary rider
1. Noun. (Australia) A person employed to travel along the boundary of a station, to check and maintain the fencing. ¹
2. Noun. (Australia sports Australian rules football) A commentator on Australian rules football games who reports from the boundary of the field of play, and interviews players on the interchange bench as well as coaching and medical staff. ¹
¹ Source: wiktionary.com