goal-line technologynoun [ U ]
uk/ˌɡəʊl.laɪn tekˈnɒl.ə.dʒi//ˌɡoʊl.laɪn tekˈnɑː.lə.dʒi/electronic devices that show whether or not the ball has crossed the goal line in sports matches, used especially when it is not clear whether a player has scored a goal or not