An Etymological Dictionary of the German Language/Strick
Strick, m., ‘string, cord,’ from the equiv. MidHG. and OHG. stric (ck), m. Its connection with Strang or streichen is dubious; it is rather related to Sans. sraj, ‘winding, twisted ornament,’ or Sans. rajju, ‘string’ (for Teut. str from Aryan sr, comp. Schwester, Strom, and strecken). — ModHG. stricken, ‘to knit,’ from MidHG. stricken, OHG. stricchen, ‘to lace, clasp, plait,’ is probably a derivative.