oversteer Syllabification: (o·ver·steer)Definition of oversteer verb Pronunciation: /ˌōvərˈstir/ [no object] (of a motor vehicle) have a tendency to turn more sharply than was intended. noun Pronunciation: /ˈōvərˌstir/ the tendency of a vehicle to turn more sharply than intended. oversteer in other Oxford dictionaries Definition of oversteer in the British & World English dictionary