1 If a bomb goes off, it explodes: --
His gun went off accidentally.
2 If food or drink goes off, it is not good to eat or drink any more because it is too old: --
3 If a warning device goes off, it starts to ring loudly or make a loud noise: --
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.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.