Oxford Advanced American Dictionary

Definition of caving noun from the Oxford Advanced Learner's Dictionary

caving

noun
caving pronunciation English ˈkeɪvɪŋ caving pronunciation American ˈkeɪvɪŋ
(also potholing) (both British English) (North American English spelunking) [uncountable]
 
the sport or activity of going into caves under the ground
He had always wanted to go caving.