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.
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.