Definition of cavers:
(n) :
A large, naturally-occurring cavity formed underground or in the face of a cliff or a hillside.
(n) :
A hole, depression, or gap in earth or rock, whether natural or man-made.
(n) :
A storage cellar, especially for wine or cheese.
(n) :
A place of retreat, such as a man cave.
(n) :
(caving) A naturally-occurring cavity in bedrock which is large enough to be entered by an adult.
(v) :
To collapse.