Etymology
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whiplash (n.)

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.

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Definitions of whiplash

whiplash (n.)
an injury to the neck (the cervical vertebrae) resulting from rapid acceleration or deceleration (as in an automobile accident);
Synonyms: whiplash injury
whiplash (n.)
a quick blow delivered with a whip or whiplike object;
Synonyms: whip / lash
From wordnet.princeton.edu