noun, noun or participle which takes 'suru'
being seated before the bell
School slang for the practice of sitting down at one's desk before the start-of-class bell rings, often encouraged as good discipline. The cross-reference 着席 means 'taking one's seat'.
See also: 着席
先生は毎朝ベル席を徹底させている。
The teacher makes sure everyone is seated before the bell every morning.
ベル席できていない生徒は廊下に立たされた。
Students who weren't seated before the bell were made to stand in the hallway.