“Underground passage” in Japanese
Short answer
Underground passage in Japanese is “抜け穴” (nukeana). Full meaning: secret passage, underground passage; loophole; hole one can go through, opening.
Other ways to say “Underground passage” in Japanese
抜穴
nukeana secret passage, underground passage; loophole; hole one can go through, opening
ぬけ穴
nukeana secret passage, underground passage; loophole; hole one can go through, opening
ぬけあな
nukeana secret passage, underground passage; loophole; hole one can go through, opening
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