boundary umpire

/B AW1 N D ER0 IY0 AH0 M P AY0 ER0/
noun
  1. 1

    A match official who decides when the ball has over the boundary line (out of bounds), and whether it was on the full from a kick. (Under the rules as of 2007, a free kick results from on the full, or a throw-in otherwise.)

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Source: https://en.wiktionary.org/wiki/boundary%20umpire