booster
UK: ˈbuːstə | US: ˈbuːstər
n. a device or substance that increases power, effectiveness, or strength
n. a dose of a vaccine that reinforces earlier treatment
n. a supporter or promoter of a person, cause, or activity
The word "booster" originates from the verb "boost," which emerged in the early 19th century, meaning "to lift or push up." The term likely derives from dialectal English or Scandinavian roots (e.g., Old Norse bósta, meaning "to puff up"). The suffix "-er" transforms it into an agent noun, denoting something or someone that performs the action of boosting. Over time, "booster" expanded from literal lifting to metaphorical enhancement, such as in vaccines or morale.
The rocket's booster engines ignited at liftoff.
She received a booster shot to strengthen her immunity.
The charity event was a morale booster for the community.
He acted as a booster for the local sports team.
The new software update serves as a performance booster.