An Etymological Dictionary of the German Language/schräg

by Friedrich Kluge

schräg, adj., ‘aslant, oblique,’ from the equiv. late MidHG. (rare) schręge; allied to UpG. Schragen, from MidHG. schrage, m., ‘wooden cross-legs of a table’; comp. Du. schraag, ‘aslant, trestle.’ Probably from an Aryan root skrak, ‘to be aslant,’ which, with the final consonant modified and nasalised, appears as skrang in schränken.