anti-roll bar
US /ˌæn.tiˈroʊl bɑːr/
UK /ˌæn.tiˈroʊl bɑːr/

1.
a torsion bar that connects opposite wheels of a vehicle to reduce body roll during cornering
:
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The mechanic replaced the worn anti-roll bar on my car.
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A stiffer anti-roll bar can improve handling but may reduce ride comfort.