What does 当番 mean?
当番 is a Japanese noun meaning “being on duty” in English. It is written as 当番 in kanji, とうばん in hiragana, and touban in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
先月の日直当番全部私に押し付けた形でエスケープした野郎だ。
He's the pest that, on last month's class-help day, escaped leaving me with all the work.