1. Have, hold, occupy, own, possess mean to be, in varying degrees, in possession of something. Have, being the most general word, admits of the widest range of application: to have money, rights, discretion, a disease, a glimpse, an idea; to have a friend's umbrella. To hold is to have in one's grasp or one's control, but not necessarily as one's own: to hold stakes. To occupy is to hold and use, but not necessarily by any right of ownership: to occupy a chair, a house, a position. To own is to have the full rights of property in a thing, which, however, another may be holding or enjoying: to own a house that is rented to tenants. Possess is a more formal equivalent for own and suggests control, and often occupation, of large holdings: to possess vast territories.

Did you mean caving?