i Register
In some senses, spelunk is marked as obsolete. Watch for register when choosing this word.
spelunk
UK /spəˈlʌŋk/ US /spəˈlʌŋk/
verb 2noun 1
Definitions
noun
1
A cave, cavern or grotto.
verb
1
To explore caves.
2
To explore a system in depth.
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