A vehicle-mounted cutting tool is disclosed. The tool broadly includes a supporting member mounted to a vehicle, a pivotable member pivotally coupled with the supporting member, and a slidable member slidably coupled with the supporting member. Contact with an object, such as a tree, and motion of the vehicle causes the slidable member to slide. Sliding of the slidable member causes the pivotable member to pivot such that it crosses at least a portion of the slidable member to cut the object.