Real Dictionary

handball
uncountable noun: Handball is the act of touching the ball with your hand during a football game, which is not allowed.
uncountable noun: In Britain, handball is a team sport in which the players try to score goals by throwing or hitting a large ball with their hand.
uncountable noun: In the United States and some other countries, handball is a sport in which players try to score points by hitting a small ball against a wall with their hand.

handball in American English
a game in which a small ball is batted against a wall or walls with the hand, alternately by opposing teams of one or two players
noun: a game, similar to squash, played by two or four persons who strike a small ball against a wall or walls with the hand

handball in British English
noun: a game in which two teams of seven players try to throw a ball into their opponent's goal
verb: to pass (the ball) with a blow of the fist