洞
tóng
#1,013 most
frequent character
used in 洪洞[Hong2tong2], a county in Shanxi
Character breakdown
Source: Make Me a Hanzi.
洞 pairs 氵 water with 同 tóng for sound. It first meant a rapid flowing current. From water cutting through, it grew to penetrate, then a hole or cave, and finally zero.
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