spelunk

[spi-luhngk]
verb (used without object)
to explore caves, especially as a hobby.

Origin:
back formation from spelunker, spelunking

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
If you plan to spelunk in caves without modern amenities, bring a headlamp and a flashlight with extra batteries.
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