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English definition of “seat belt”

seat belt

noun [C]     (also safety belt)
a belt that fastens around someone travelling in a vehicle or aircraft and holds them in their seat, in order to reduce the risk of them 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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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