To pull in front of another vehicle in traffic, especially to do so dangerously or unfairly.
To begin riding a wave in front of someone else whose legitimate turn it is.
To join a queue in the middle, as opposed to at the back.
When painting, to paint edges, corners, or trim in preparation for rolling larger areas.
To interpose oneself; to intervene.
To insert something between other things.
To say as an interruption or aside.