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a rocket that gives a spacecraft or missile the extra power it needs to leave the Earth's atmosphere
an additional dose of vaccine required periodically in order to increase, maintain, or renew the effects of a previous one
What is a "booster"?
A booster is an extra dose of a vaccine given to strengthen the immune response after the first doses. Boosters are typically given after the first vaccination series to ensure long-term protection against certain diseases. They help strengthen the body's defense and provide added protection against infections that may decrease over time or need extra support.
an amplifier for restoring the strength of a transmitted signal
a thief who steals goods that are in a store
someone who is an active supporter and advocate
a person who backs a politician or a team etc.
something that enables a person or thing to improve or increase
