seat belt

US /ˈsiːt belt/
UK /ˈsiːt belt/
"seat belt" picture
1.

a strap or harness designed to secure a person in a seat, especially in a vehicle or aircraft, to prevent injury in the event of a collision or sudden stop

:
Always fasten your seat belt before driving.
The flight attendant reminded everyone to keep their seat belts fastened during turbulence.