墓穴|ぼけつboketsu[0]heiban (flat)

1. noungrave (pit)
   彼かれは自みずから墓穴ぼけつを掘ほってるね。↗

   He is digging his own grave.

• Related墓はかNeutralThe neutral, most general word for a grave, including the gravestone; 「墓穴」 is specifically the burial pit, and figuratively one's own downfall.
• Related墳墓ふんぼWrittenFormal, for graves or tombs, found mainly in legal and academic contexts, as in 「墳墓の地」.
• Related塚穴つかあなWrittenA written word for a burial pit, used very rarely; say 「墓穴」 in ordinary contexts.

For a grave in general say 「墓」; 「墓穴」 is the pit for burial, often in the idiom 「墓穴を掘る」 (digging one's own grave); in legal contexts use 「墳墓」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 遺体いたいや遺骨いこつを埋葬まいそうするための穴あな。はかあな。