三さん徹てつ

noun, noun or participle which takes 'suru'

triple all-nighter; staying up all night three nights in a row

Slang term used among students or in casual contexts to describe pulling three consecutive all-nighters, often for studying or work deadlines.

• 試し験けん前まえに三さん徹てつするのは体からだに悪わるいよ。

  Pulling three all-nighters before exams is bad for your health.

• 彼かれは三さん徹てつでプロジェクトを終おわらせた。

  He finished the project by staying up all night for three nights straight.