booster

US /ˈbuː.stɚ/
UK /ˈbuː.stɚ/
"booster" picture
1.

a device for increasing power or effectiveness

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The car has a brake booster for improved stopping power.
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They installed a signal booster to improve cell phone reception.
:
amplifierenhanceraugmenterreinforcerstimulator
2.

a supplementary dose of a vaccine given to maintain or renew the effectiveness of a previous vaccination

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She received a booster shot for tetanus.
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Many countries are recommending a third booster dose for COVID-19.
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reinforcementsupplementtop-uprefresher
3.

a person or thing that helps to improve or promote something

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The new marketing campaign was a big booster for sales.
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He's a strong booster of local businesses.
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supporterpromoteradvocatechampionpatron
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booster seat