- blaspheme (v.) mid-14c., from O.Fr. blasfemer "to blaspheme" (14c., Mod.Fr. blasphémer), from Eccles.L. blasphemare (also in Late Latin "revile, reproach"), from Gk. blasphemein "to speak lightly or amiss of sacred things, to slander," from blasphemos "evil-speaking" (see BLASPHEMY (Cf. blasphemy)). A reintroduction after the original word had been worn down and sense-shifted to BLAME (Cf. blame). Related: Blasphemed; blaspheming.
Etymology dictionary. 2014.