toe the line

verb
  1. 1

    To abide by the rules or conventions.

    โ€œTelevision shows these days do not always toe the line of decency and common sense.โ€

  2. 2

    To stand at one's mark before a footrace.

    โ€œAlberto Salazar is one of the most famous athletes to have toed the line at this great race.โ€

Source: https://en.wiktionary.org/wiki/toe%20the%20line