busboy
A restaurant worker who clears tables, refills water, and assists waitstaff. The term is a direct loan from English and is used in Japanese to refer to the same role, often in Western-style restaurants or hotels.
He works as a busboy at a restaurant on weekends.
The busboy is clearing the table.
Borrowed from English 'busboy', a compound of 'bus' (to clear tables) and 'boy'.