cave

verb

explore natural caves
天然の洞窟を探検する
hollow out as if making a cave or opening
洞窟または穴を掘るようにくり抜く
- The river was caving the banks
  川は土手を陥没させていた

noun

a geological formation consisting of an underground enclosure with access from the surface of the ground or from the sea
地面の表面、または海からのアクセスのある地下の囲い地から成る地層

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