Etymology
From Middle English *grovelen, from Old Norse grufla, grœfla (“to grovel”), from Proto-Germanic *grubilōną (“to dig, delve into”), from Proto-Indo-European *gʰrebʰ‑ (“to dig, scrape, scrabble, scratch”); akin to Old Norse á grufu (“on one's belly”) ( > Old Norse grúfa (“to lie face down, grovel”)). Cognate with Scots grovel, gruvil (“to grovel”), German grübeln (“to meditate, ponder”), Norwegian Nynorsk gruvla (“to grovel”). Compare also West Frisian groebeltsje (“to make a mess, skip school, skive”), Dutch grobbelen (“to grope, root, grub”).