A chaser is a drink you drink after taking a shot. Usually beer. People use it to try and blunt the harsh feeling the shot can leave in your mouth.
A drink you use to wash down a shot of alcohol.
It's a drink you take after a shot of hard liquor to get the harsh alcohol sting out of your mouth. Most people use soda, I use beer.
The Chaser is the oldest position in the game of Quidditch, as the purpose of the game once consisted solely of scoring goals. They were formerly known as Catchers in the early days of the game. The one major change to the role of the Chaser was in 1884, when the rules were changed that allowed only one Chaser into the scoring area while trying to score a goal. This was done in an effort to stop Stooging during a game.