A barbershop (a place where men's hair is cut) or a barber who works there. A casual/common term; also called '理髪店' in some areas.
今日は床屋に行って、短く髪を切ってもらった。
I went to the barber today and had my hair cut short.
床屋の前に行列ができていた。
There was a line in front of the barber shop.
うちの近くには昔ながらの床屋がある。
There's an old-fashioned barber near my home.