As a Noun:
1. The player in a sports team, especially a soccer team, whose job is to guard the goal. English = goalkeeper. Informal English = goalie.
2. In cricket, a player who is fielding (rather than bowling or keeping the wicket) or one who has particular skill at fielding. English = fielder.
As a Verb or Adjective:
1. To guard the goal in a game, especially soccer.
2. In a game of cricket, to be the team that is trying to catch the ball, rather than batting. English = field.