Usually a Baseball team's best relief pitcher. He comes in for the last inning to "shut the door" on the other team and preserve a tight game when his team is on top. As opposed to breaking balls and offspeed junk, he usually comes in and throws his outstanding fastball and, typically, slider.
The 8th inning is the real last chance for our sox to fight back. Mariano Rivera (most acclaimed closer ever) is warming up in the bullpen.
In basketball, the player who comes in in late-game situations with a lead to protect. The closer prevents the other team from coming back by sinking clutch shots, drawing fouls, and making big plays on D. See Kobe Bryant
Man I thought for sure the Suns were gonna come back, but then Phil Jackson sent the closer back out and I knew we were done.
One of the enemies in Silent Hill 3. The Closer is a tall creature with ball-like hands, a seizuring and penis-like head, and very tall legs almost pointy. Attacks by using its hands that emit a tongue, or by spinning its hands around crudely.
"I think it has this name because its height beings it a little 'closer' to Heaven than most others."