Booster Common

a person who backs a politician or a team etc.

"all their supporters came out for the game"

"they are friends of the library"

someone who is an active supporter and advocate

"The local booster organized several fundraisers to ensure the new library would be built on time."

a thief who steals goods that are in a store

"The booster snuck into the electronics section to steal laptops before the manager could notice."

an amplifier for restoring the strength of a transmitted signal

"The technician installed a new booster to amplify the weak radio signal before it reached the main tower."

the first stage of a multistage rocket

"The booster separated from the main fuselage after burning through its fuel supply."

an additional dose that makes sure the first dose was effective

"The doctor recommended a booster shot to ensure the initial vaccination had been fully effective."

Something that boosts.

"The new fertilizer acted as an excellent booster for the struggling tomato plants."