From Middle English crawlen, crewlen, creulen, crallen, *cravelen, from Old Norse krafla (compare Danish kravle, Swedish kravla), from Proto-Germanic *krablōną (compare Dutch krabbelen, German Low German krabbeln, German krabbeln), frequentative of *krabbōną. Compare also West Frisian kreauwelje, Dutch krevelen, krieuwelen, German Low German kribbeln, German kribbeln. See also crab, crabble.