rear end
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.
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Source: A Dictionary of American Idioms
