Grovel
Middle English: back-formation from the obsolete adverb grovelling, from obsolete groof, grufe ‘the face or front’ (in the phrase on grufe, from Old Norse á grúfu ‘face downwards’) + the suffix -ling .
wiktionary
From Old Norse á grufu(“on one's belly”) ( > Old Norse grúfa(“to grovel”)).
etymonline
grovel (v.)
1590s, Shakespearean back-formation from groveling "on the face, prostrate" (mid-14c.), also used in Middle English as an adjective but probably really an adverb, from gruffe, from Old Norse grufe "prone" + obsolete adverbial suffix -ling (which survives also as the -long in headlong, sidelong). The Old Norse word is found in liggja à grufu "lie face-down," literally "lie on proneness." Old Norse also had grufla "to grovel," grufa "to grovel, cower, crouch down." The whole group is perhaps related to creep (v.). Related: Groveled; grovelled; groveling; grovelling.
