Line-out is a term used primarily in rugby, where it refers to a method of restarting play after the ball has gone out of bounds. But there are a number of other terms that can be used to describe the same concept. One common alternative is a throw-in, which is used in soccer to refer to the same type of play. In basketball, a similar concept is known as an inbounds pass. Other possible synonyms include boundary throw, sideline throw, or simply a restart. Ultimately, it doesn't matter which term is used, as long as both teams understand the rule and are ready to play.