Definitions
1.VerbTo look backwards over one's shoulder while driving or biking, before changing lanes or making a turn, to see if any vehicles are in one's blind spots.
2.VerbTo check (strongly bump into) with one's shoulder(s).
3.NounAn instance of looking backwards over one's shoulder while driving or biking, before changing lanes or making a turn, to see if any vehicles are in one's blind spots.
4.NounAn instance of checking (strongly bumping into) with one's shoulder(s).