shoulder check noun 2verb 2forms 3 noun2 •(US, Canada) An 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. •An instance of checking (strongly bumping into) with one's shoulder(s). verb2 •(US, Canada) To 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. •To check (strongly bump into) with one's shoulder(s). formsshoulder checked · shoulder checking · shoulder checks