whiplash

noun

a quick blow delivered with a whip or whiplike object
鞭または鞭のような物で素早く行われる一撃
- the whip raised a red welt
  むちで赤いみみず腫れができた
an injury to the neck (the cervical vertebrae) resulting from rapid acceleration or deceleration (as in an automobile accident)
急激な加速、あるいは減速によって受ける首（頚椎）の損傷（自動車事故など）

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