Tombstoning is a dangerous activity that involves jumping or diving into water from high cliffs or other structures. It is often associated with thrill-seeking and reckless behavior. There are several synonyms for this term, including cliff diving, bridge jumping, and high diving. These activities pose serious risks to those who participate in them, including injury or death. It is important to consider the potential consequences before engaging in any high-risk activity. While some may find thrill-seeking activities like tombstoning exhilarating, it is crucial to remember that safety should always come first.