a waiter's helper in a restaurant or other public dining room.
Also, bus boy.

1910–15, Americanism; bus- short for omnibus waiter's helper (see omnibus) + boy

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
He dug ditches at a construction company owned by a friend's family and worked
  as a restaurant busboy.
The busboy was almost angelic in that white service coat, his eyes drained of
  innocence, the background a dark blur.
He evaluated the restaurants from the owner down to the busboy and pulled no
  punches about what was wrong and what was right.
Every waiter and busboy and reveler has left the hotel nightclub, but the
  balloons and the confetti remain.
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