crawl (v.)youdaoicibaDictYouDict[crawl 词源字典]
c. 1200, creulen, from a Scandinavian source, perhaps Old Norse krafla "to claw (one's way)," Danish kravle, from the same root as crab (n.1). If there was an Old English *craflian, it has not been recorded. Related: Crawled; crawling.[crawl etymology, crawl origin, 英语词源]
crawl (n.)youdaoicibaDictYouDict
1818, from crawl (v.); in the swimming sense from 1903, the stroke developed by Frederick Cavill, well-known English swimmer who emigrated to Australia and modified the standard stroke of the day after observing South Seas islanders. So called because the swimmer's motion in the water resembles crawling.