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Old English wǣpn (inherited)
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Middle English wepen (inherited)
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West Frisian wapen (cognate)
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Proto-Germanic *wēpną (inherited)
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Proto-Indo-European *wēbnom (derived)
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Icelandic vopn (cognate)
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Low German wapen (cognate)
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Swedish vapen (cognate)
→
Alemannic German Waaffe (cognate)
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Luxembourgish Waff (cognate)
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Saterland Frisian Woapen (link)