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|Kanji in this term|
|とこ > どこ
Compound of 寝 (ne, “sleeping”, the 連用形 (ren'yōkei, “continuative or stem form”) of Old Japanese verb 寝 nu, modern 寝る neru, “to sleep”) + 床 (toko, “place; raised area, raised bed”). The toko changes to doko due to rendaku (連濁).