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洞 has 2 dictionary pronunciations. The examples show how each reading behaves in real words.
cave; hole; zero (unambiguous spoken form when spelling out numbers)
used in 洪洞[Hong2 tong2], a county in Shanxi
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The decomposition shows how the visual pieces fit together, not necessarily the character’s historical origin.
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leak
cave
cavity
paradise
tunnel
to punch a hole
insight
to be wide open
passageway
pierce
to penetrate
dog door
Notice where 洞 sits in each complete thought.
It's not a bug, it's an undocumented feature.
Source: Tatoeba #480651 · CC BY 2.0 FRTom will be the first person to enter the cave.
Source: Tatoeba #11231367 · CC BY 2.0 FRHow many caves are there in this area?
Source: Tatoeba #9971529 · CC BY 2.0 FRTom found a skeleton in the cave.
Source: Tatoeba #8560799 · CC BY 2.0 FRYou've got a big hole in your sock.
Source: Tatoeba #476650 · CC BY 2.0 FRThere is a hole in your sock.
Source: Tatoeba #1878281 · CC BY 2.0 FRDefinitions and traditional forms are compiled from Make Me a Hanzi, HSK curriculum data, and CC-CEDICT. Sourced example sentences link to Tatoeba; editorial examples are labeled separately. Review data sources and licenses.