booster

A person or thing that helps something work better or become stronger.

• The win was a confidence booster.
• We bought a signal booster for the house.
• Local boosters helped raise money for the club.

Similar words: supporter, enhancer

Common phrases: confidence booster, signal booster, morale booster

An extra vaccine dose that helps keep you protected against a disease.

• I had a booster yesterday.
• The clinic offers tetanus boosters.
• When did you get your last booster?

Similar words: booster dose, booster shot

Common phrases: booster dose, tetanus booster, get a booster

A rocket that supplies extra force to help a spacecraft rise or a missile travel farther.

• The booster lifted the rocket.
• Two boosters separated shortly after launch.
• Engineers tested the missile's new booster.

Similar words: booster rocket

Common phrases: rocket booster, solid-fuel booster, booster rocket

A person who steals things, especially from shops.

• The guard caught a booster.
• Two boosters had stolen clothes from the shop.
• Police questioned the booster about the missing goods.

Similar words: thief, shoplifter

Common phrases: catch a booster, booster stole something