booster shot

noun

: a supplementary dose of an immunizing agent administered as an injection

called also booster, booster dose

Examples of booster shot in a Sentence

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

Recent Examples on the Web

Key Takeaways There is no official recommendation for a summer COVID booster shot. —Korin Miller, Verywell Health, 5 June 2024

Further increasing the likelihood of infection is the fact that most people who have been vaccinated are far removed from their last COVID-19 booster shot. —Rong-Gong Lin Ii, Los Angeles Times, 1 July 2024

Even among the highest-risk group, individuals 75 and older, just 36 percent received the booster shot in the fall and winter. —Leana S. Wen, Washington Post, 4 July 2024

Summer Booster Recommendations As of right now, there are no recommendations for a summer booster shot. —Korin Miller, Verywell Health, 5 June 2024

Word History

First Known Use

1944, in the meaning defined above

Kids Definition

booster shot

noun

: an extra dose of an immunizing agent given to maintain or restore the effects of previously established immunity

Medical Definition

booster shot

noun

: a supplementary dose of an immunizing agent administered as an injection

… the state is requiring older children to have additional booster shots for measles, mumps and rubella.

—Ann Schrader, The Denver Post

see booster, booster dose