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共 [in common]
共
is in
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Original meaning:
put together → joint | united | in common
On-reading:
キョウ
as in
中共
chūkyō
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KYŌ tomo -domo
in common
-共
-domo
"humble plural" suffix
私共
watakushidomo
we, us (humble)
中共
chūkyō
Communist China