Proto-Japanese: *kúmpuá
Meaning: 1 cavity 2 to be concave, hollow
Russian meaning: 1 впадина, углубление 3 быть вогнутым, полым
Old Japanese: kub(w)o 1, kub(w)o-m- 2
Middle Japanese: kúbó 1, kúbóm- 2
Tokyo: kubo 1, kùbo-m- 2
Kyoto: kúbóm- 2
Kagoshima: kubóm- 2
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