Booster
/ˈbuːstər/noun
A person or thing that increases, promotes, or supports something.
Did you know?‘Booster’ comes from the verb *boost*, which likely began in regional English with the sense of giving something a shove or lift, and only later became the name for someone who promotes a cause or product.
Etymological Timeline
Late 18th–Early 19th Century
English
boost
“To push upward or raise, especially by helping someone climb or giving a lift.”
19th Century
English
booster
“Originally a person who gave support or encouragement; later, one who promotes a person, product, or cause.”
19th Century
English
boosting
“The act of giving support, raising, or promoting something.”
Modern English
English
booster
“A person or thing that increases effectiveness, enthusiasm, or protection, especially in a vaccine or promotional sense.”