High Quality Content by WIKIPEDIA articles! "Toe the line" is an idiomatic expression meaning to conform to a rule or a standard. The term has disputed origins. Perhaps its longest-running use is from the British House of Commons where sword-strapped members were instructed to stand behind lines that were better than a sword's length from their political rivals in order to restore decorum. In days of sail, "toe the line" was used as a command for the sailors to line up along a crack in deck planking, similar to the modern "Attention!" Over the years the term has been attributed to sports, including toeing the starting line in track events and toeing a center line in boxing which boxers were instructed to line up on either side of to start a match.