0 in football, a small, red card that is shown by the referee (= the official who is responsible for making certain that the rules are followed) to a player who has not obeyed a rule and who is therefore not allowed to continue playing --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Vi kan slutföra det steg för steg hur lång vägen än är och den kan inte slutföras hur kort vägen än är om du inte ens markerar ditt fotavtryck.