0 someone or something that continually causes problems for you: --
Money problems have been a thorn in our side since the day we got married.
Health inspectors are a thorn in the side of most restaurants.
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.