pretensioner
noun
pre·ten·sion·er
ˌprē-ˈten(t)-sh(ə-)nər
plural pretensioners
: 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
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Merriam-Webster unabridged
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