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Old English slæc (inherited)
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Middle English slak (inherited)
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Middle English slakken (inherited)
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Middle English slaken (mention)
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Middle English slak (inherited)
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Proto-Germanic *slakaz (inherited)
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Ancient Greek λαγώς (mention)
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Ancient Greek λάγνος (cognate)
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Norwegian Bokmål slapp (link)
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Old Norse slakr (cognate)
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Sanskrit लङ्ग (cognate)