Incomplete pass
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An incomplete pass, is a term in American football which means that a legal forward pass hits the ground before a player on either team gains possession. For example, if the quarterback throws the ball to one of his wide receivers, and the receiver either does not touch it, or tries to catch it unsuccessfully, it is ruled as an incomplete pass. An incomplete pass causes the down to advance by one and the offensive team gains no yards. Additionally, the game clock is stopped. However, if the receiver catches the ball, has possession of it (rules vary by league), then loses control of it for any reason, it is ruled a fumble. If a member of the opposing team gains possession of the ball before it hits the ground, it is ruled an interception.
If the receiver (or a defending player) is touched by a member of the opposing team in a way that prevents him from catching the ball, it is ruled pass interference, resulting in a penalty against the touching player's team. The exception to this rule is if the ball is deemed 'uncatchable' by the referees, in which case a pass interference penalty is impossible.
