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Longman Dictionary of Contemporary English
drop goal
noun
EXAMPLES FROM CORPUS
▪ And a late drop goal from Kiwi stand-off Henry Paul completed a dramatic turn-around.
▪ Cardiff won 15-6, with four penalties and a drop goal by fly half Adrian Davies.
▪ Fox scored two tries, five goals and a neatly-taken drop goal.
▪ If the drop goal were reduced to two points and the penalty goal to two points, that would be more sensible.
▪ The try is to be worth five points while the drop goal will count for two points.
Wiktionary
drop goal

alt. (context rugby union rugby league English) A goal scored by kicking the ball through the goal from open play, after the ball has touched the ground. n. (context rugby union rugby league English) A goal scored by kicking the ball through the goal from open play, after the ball has touched the ground.

Wikipedia
Drop goal

If the drop goal attempt is successful, play stops and the non-scoring team (the scoring team in rugby union sevens) restarts play with a kick from halfway. If the kick is unsuccessful, the offside rules for a kick apply and play continues until a normal stoppage occurs. Because of the scoring attempt this is usually from the kicked ball going dead or into touch. Defenders may tackle the kicker while he is in possession of the ball, or attempt to charge down or block the kick.