Sew

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Old English siwan, of Germanic origin, from an Indo-European root shared by Latin suere and Greek suein .

wiktionary

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From Middle English sewen, seowen, sowen, from Old English sīwian, sēowian, sēowan(“to sew, mend, patch, knit together, link, unite”), from Proto-Germanic *siwjaną(“to sew”), from Proto-Indo-European *syewh₁-(“to sew”). Cognate with Scots sew(“to sew”), North Frisian saie, sei(“to sew”), Saterland Frisian säie(“to sew”), Danish sy, Polish szyć, Russian шить(šitʹ), Swedish sy, Latin suō, Sanskrit सीव्यति(sī́vyati). Related to seam.

Back-formation from  sewer(“a drain”). 

From Middle English sew(“broth”), from Old English sēaw(“sap, juice”), from Proto-West Germanic *sauw.

etymonline

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sew (v.)

Old English siwian "to stitch, sew, mend, patch, knit together," earlier siowian, from Proto-Germanic *siwjanan (source also of Old Norse syja, Swedish sy, Danish sye, Old Frisian sia, Old High German siuwan, Gothic siujan "to sew"), from PIE root *syu- "to bind, sew." Related: Sewed; sewing. To sew (something) up "bring it to a conclusion" is a figurative use attested by 1904.