autocross /ˈɔːtəʊˌkɹɒs/noun 1verb 1forms 3 noun1 •A form of motorsport that tests the skill and speed of a driver over a course marked out with traffic cones verb1 •To take part in this sport.It may be helpful to join a car club that autocrosses because the club will have organized, periodic events that someone else has already set-up ^([sic]) and coordinated. — 2000 formsautocrossed · autocrossing · autocrosses