REAR END

{n.} 1. The back part (usually of a vehicle) * /The rear end of our car was smashed when we stopped suddenly and the car behind us hit us./ - Often used like an adjective, with a hyphen. * /A head-on crash is more likely to kill the passengers than a rear-end crash./ Contrast: HEAD-ON. 2. Rump; backside. * /Bobby's mother was so annoyed with his teasing that she swatted his rear end./