Staying behind after work or class to continue working; working overtime.
昨日は納期が近くて、居残りで書類を仕上げた。
Yesterday the deadline was close, so I stayed late to finish the documents.
彼は毎晩居残りしてプログラムのバグを直している。
He stays late every night to fix bugs in the program.
居残りが続くと体を壊すから、適度に休んだほうがいい。
If you keep staying late, you'll ruin your health, so it's better to rest appropriately.
Detention; being kept behind (e.g., after school) as punishment or for extra work.
授業中にふざけて、放課後に居残りをさせられた。
I messed around during class and was made to stay after school.
居残りで作文を書かされ、帰りが遅くなった。
I was made to write an essay as detention and got home late.
彼は宿題を忘れて居残りになったが、その経験を反省した。
He was kept after school for forgetting his homework, but he reflected on the experience.