The Collaborative International Dictionary
Corner \Cor"ner\, n. (Association Football) [More fully corner kick.] A free kick from close to the nearest corner flag post, allowed to the opposite side when a player has sent the ball behind his own goal line.
Wiktionary
n. (context soccer English): A kick awarded to the attacking team when the ball leaves the field of play by wholly crossing the goal line without a goal having been scored, having last touched a player from the defending team. For the kick, the ball is placed within the corner arc closest to where the ball went out of play.
WordNet
n. a free kick from the corner awarded to the other side when a player has sent the ball behind his own goal line
Wikipedia
A corner kick is a method of restarting play in a game of association football. It was devised in Sheffield under the 1867 Sheffield Rules. It was adopted by the Football Association on 17 February 1872.
A corner kick is awarded to the attacking team when the ball leaves the field of play by crossing the goal line (either on the ground or in the air) without a goal having been scored, having been last touched by a defending player. The kick is taken from the corners of the field of play nearest to where the ball crossed the goal line. Corners are considered to be a reasonable goalscoring opportunity for the attacking side, though not as much as a penalty kick or a direct free kick near the edge of the penalty area.
The assistant referee will signal that a corner should be awarded by first raising his flag, then using it to point at the corner arc on their side of the pitch; however, this is not an indication of which side the kick should be taken from. The referee then awards the corner by pointing to the relevant arc.
Usage examples of "corner kick".
With a minute to go, Chelsea was a man down but pressing for a tie and getting corner kick after corner kick to try for a header.
Less than a minute later Paul headed one in on a corner kick, and just before the end of the half Tony scored again.