Noun
underride (plural underrides)
A vehicle accident in which one vehicle partially slides underneath another.
Another benefit of having a sturdy underride guard is that it may be secured to a loading dock with a hook to prevent " trailer creep ", a movement of the trailer away from the dock, which opens up a dangerous gap during loading or unloading operations. Source: Internet
Western European standards for underride guards have been stricter than North American standards, which typically have allowed grandfathering of older equipment that may still be on the road for decades. Source: Internet