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Old English smōþ (inherited)
←
Old English smēþe (inherited)
←
Middle English smoothe (inherited)
←
Middle English smothe (mention)
←
Middle English smethe (mention)
←
Low German smood (cognate)
→
Japanese スムーズ (borrowed)
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Norwegian Bokmål slette (link)
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Norwegian Bokmål jevne (link)
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Norwegian Nynorsk sletta (link)
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Norwegian Nynorsk slett (link)