Definition of advantage law in English:

advantage law

noun

Rugby Football Sport
  • A rule whereby the referee or umpire may choose not to award (or to defer the award of) a penalty, free kick, etc., when a foul or other infringement is committed, in order to determine if the opposing team gain a greater advantage from continuing play.

Origin

Early 20th century; earliest use found in Spalding's Official Rugby Foot Ball Guide.