pretensioner

noun
pre·​ten·​sion·​er | \ ˌprē-ˈten(t)-sh(ə-)nər How to pronounce pretensioner (audio) \
plural pretensioners

Definition of pretensioner

: a mechanism that tightens and locks automobile seatbelts in place in the event of a crash or hard braking Pretensioners, like air bags, rely on a small explosive charge to tighten belts fast enough to reduce injuries even in high-speed crashes.— Mark Phelan

First Known Use of pretensioner

1979, in the meaning defined above

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The first known use of pretensioner was in 1979

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