Dictionary

booster shot

noun

: an extra amount of a substance (called a vaccine) that is injected with a needle into a person or animal to help protect against a particular disease

Full Definition of BOOSTER SHOT

:  a supplementary dose of an immunizing agent —called also booster, booster dose

Examples of BOOSTER SHOT

  1. He had to get two booster shots at his latest checkup.

First Known Use of BOOSTER SHOT

1944

booster shot

noun    (Medical Dictionary)

Medical Definition of BOOSTER SHOT

:  a supplementary dose of an immunizing agent—called also booster, booster dose

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