0 to interrupt what someone is saying by saying something yourself: --
I was just talking to Jan, when Dave cut in (on us/our conversation).
1 to make a sudden sideways movement in order to position your car in front of another car, not leaving a safe distance between the two vehicles: --
2 If a machine cuts in, it starts, usually automatically: --
3 to interrupt two people who are dancing in order to dance with one of them: --
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.
We kunnen het stap voor stap voltooien, hoe lang de weg ook is en het kan niet worden voltooid, hoe kort de weg ook is, als je niet eens je voetafdruk markeert.