Line-out meaning : An audio jack that produces an unamplified signal To appear in a lineout To take part in a sports event A set piece where a player throws the ball into play, and both teams can contest for possession. An out produced by catching a line drive A set piece where the hooker throws the ball into play between a row of players from each team. The lineup of players in a lineout (sense 1). An out produced by catching a line drive.