An occasion when someone stays awake all night, typically to study or work.
Mid 20th century: from all + nighter, on the pattern of all-dayer.
- I pulled an all-nighter to finish my project before deadline.
- He had an all-nighter before the final exam.
- She was used to pull all-nighters during her college days.
- We had a team all-nighter to complete the presentation.
- He spent most of the night at the library for an all-nighter session.