From Middle English syns, sinnes, contraction of earlier sithens, sithence, from sithen ( + -s, adverbial genitive suffix), from Old English sīþþan, from the phrase sīþ þǣm, from sīþ + þǣm dative singular of þæt. Cognate with Dutch sinds ("since"), German seit ("since"), Danish siden ("since"), Scots syne ("since").
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