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Từ điển Oxford Advanced Learner 8th
spelunking
spe·lunk·ing BrE [spɪˈlʌŋkɪŋ] NAmE [spɪˈlʌŋkɪŋ] (NAmE) (BrE cav·ing, pot·hol·ing) noun  uncountable
the sport or activity of going into ↑caves under the ground
Derived Word: ↑spelunker
See also: ↑caver ▪ ↑caving ▪ ↑potholer ▪ ↑potholing
Word Origin:
1940s: from obsolete spelunk ‘cave’ (from Latin spelunca) + ↑-ing.
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