In baseball, ejection is an action taken by an umpire which removes a player, coach or manager from the game. The person ejected must leave the field of play and may not remain in the dugout until the game has concluded. A player, coach or manager may be ejected by any umpire on the field who believes the person in question is behaving in an unsportsmanlike manner.
Most ejections are the result of an infraction of baseball rules, lack of respect towards the officials or perceived malicious behavior. Managers and coaches are typically ejected if they take an argument too far through physical actions or insults, while players can often be ejected for attempting to hit other players with a pitch or initiating a physical confrontation with another player.
Bobby Cox holds the MLB record for ejections with 161.