Yours, Etc.: Origins and Uses of 8 Sign-Offs
early 13c., from causative of Old English cringan "give way, fall (in battle), become bent," from Proto-Germanic *krank- "bend, curl up" (cf. Old Norse kringr, Dutch kring, German Kring "circle, ring"). Related: Cringed; cringing. As a noun from 1590s.