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

 

spelunking

 noun
noun
BrE BrE//spɪˈlʌŋkɪŋ//
 
; NAmE NAmE//spɪˈlʌŋkɪŋ//
 
(North American English)(especially British English caving, British English potholing)[uncountable]
 
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the sport or activity of going into caves under the ground Word Origin 1940s: from obsolete spelunk ‘cave’ (from Latin spelunca) + -ing.
See the Oxford Advanced American Dictionary entry: spelunking

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