whiplash (n.)youdaoicibaDictYouDict[whiplash 词源字典]
1570s, "the lash of a whip," from whip (n.) + lash (n.). The injury caused by sudden head motion so called by 1955, in reference to the notion of moving to and fro like a cracking whip. The verb in this sense is recorded by 1971.[whiplash etymology, whiplash origin, 英语词源]