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English definition of “seat belt”

seat belt

noun [C] uk   (also safety belt) us  
a belt that fastens around you when you are travelling in a vehicle or aircraft and holds you in your seat, in order to reduce the risk of being injured in an accident: Do you know how to fasten/do up your seat belt? You must wear your seat belt.The interior of vehicles
(Definition of seat belt from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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