Phrase guide

booster shot

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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No pronunciation record was provided for this word.

1

noun

Meaning 1

A dose of an antigen (usually a vaccine) designed to strengthen immunity after an earlier immunizing dose.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

an additional dose that makes sure the first dose was effective

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: booster, booster dose, recall dose

Antonyms: none provided

Broader terms: dose, dosage

History

Etymology

No etymology was provided for this word.