“Mum” in Japanese
Short answer
Mum in Japanese is “母ちゃん” (kaachan). Full meaning: mum, mom, mummy, mommy; the missus.
Other ways to say “Mum” in Japanese
お母ちゃん
okaachan mum, mom
ママ
mama mom, mommy, mum, mummy, mother, mama, mamma; female proprietress (of a bar, etc.)
お母さん
okaasan mother, mom, mum, ma; wife; you (of an elderly person older than the speaker), she, her
御っ母さん
okkasan mother, mom, mum, mama
まま
mama mom, mommy, mum, mummy, mother, mama, mamma; female proprietress (of a bar, etc.)
真間
mama mom, mommy, mum, mummy, mother, mama, mamma; female proprietress (of a bar, etc.)
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