hit from behind
- rear-endedHit from behind
- blindsidedSurprised by unforeseen impact
- ambushedAttacked from concealment
- sucker-punchBlow dealt without warning
- whiplashNeck injury from jerking
collision · crash · tailgated · slammed · struck · smashed · bumper · fender-bender · backstabbed · unexpected · surprise · impact · jolt · crunch · shunt · pileup · brake · trunk