What does 洞 mean?
洞 is a Japanese noun meaning “hollow; cavity; hole; cave” in English. It is written as 洞 in kanji, ほら in hiragana, and hora in romaji. This word is part of JLPT N4 vocabulary.
Example sentence
洞窟からうつろに反響する音を耳にした。
We heard somber hollow sounds from the cave.