seat belt 
noun
A belt used to secure someone in the seat of a motor vehicle or aircraft.They should only wear a two-point lap belt if a three-point seat belt is not available....
- She let the operators slip off her high-heels, fasten the seat belt, and pull over the metal strap.
- Strangely, though, when you omit to fasten your seat belt the car lets out a single soft, sweet, sustained chime.
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