whiplash - definition and synonyms

noun 

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/ˈwɪpˌlæʃ/
singularwhiplash
pluralwhiplashes
  1. 1
    [uncountable] a serious injury affecting your neck, caused when the vehicle that you are in is hit from behind by another vehicle, which makes your head move violently
  2. 2
    [countable] a hit from a whip