godan verb (-mu), intransitive verb
stay overnight; stop at a hotel
Implies staying somewhere overnight, often with the nuance of settling in for the night, such as at a hotel, a friend's place, or even at work.
仕事が忙しくて、会社に泊まり込んだ。
I was so busy with work that I stayed overnight at the office.
旅行中は安いホテルに泊
During the trip, I stayed at cheap hotels.