understeerPronunciation: /ˈʌndəstɪə/Definition of understeer verb [no object] (of a motor vehicle) have a tendency to turn less sharply than is intended:the turbo understeers on very fast bends noun [mass noun] the tendency of a vehicle to turn less sharply than intended: Alonso’s car was suffering from severe understeerundersteer in other Oxford dictionaries Definition of understeer in the US English dictionary