booster

Definitions

A device, substance, or action that increases the power, effectiveness, or intensity of something.

A dose of a vaccine given after the primary dose to increase or maintain immunity.

An auxiliary engine or rocket used to assist the takeoff or acceleration of a spacecraft or aircraft.

Examples

The government is encouraging all citizens to get a booster shot before the winter season begins.

The new marketing campaign served as a major booster for the company's declining sales figures.

Synonyms

supporter advocate promoter champion enthusiast backer proponent

Antonyms

critic opponent detractor adversary naysayer challenger disparager