Entry from US English dictionary
A large rounded nut that fits over a heavy bolt, used especially to attach the wheel of a vehicle to its axle.
- Consider what happens, for example, if you leave a lug nut off a car wheel; you run the risk of the car careening off the road.
- There is a storm coming behind us from the west and one of the lug bolts has come loose from the wheel, so that I can't get the lug nut off.
- That means that you were the one that didn't tighten the lug nut down.
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