Translation guide
The English word "booster" covers several distinct concepts. This guide helps you choose the right Japanese expression depending on whether you mean a vaccine booster, a confidence booster, a rocket booster, or a general enhancer.
An additional dose of a vaccine to maintain immunity.
Standard medical term for a booster shot. Literally 'additional inoculation'.
I received a COVID vaccine booster.
Commonly used in news and official contexts, combining the loanword 'booster' with 'inoculation'.
Reservations for booster shots have started.
The loanword by itself is widely understood in context, especially in casual conversation.
I plan to get the booster next month.
Something that increases confidence, morale, or motivation.
A natural way to say 'something that boosts confidence'. Literally 'thing that attaches confidence'.
This success was a big confidence booster.
Used for morale boosters in team or organizational contexts. 'Something that raises morale'.
Literally 'vitality agent', sometimes used figuratively for an energy or motivation booster. Can sound like a supplement.
A rocket engine used to provide extra thrust during launch.
A device or substance that increases power, performance, or effect.
Used for electronic signal boosters, performance boosters, etc. The loanword is common in technical and consumer contexts.
I installed a Wi-Fi booster.
Technical term for amplifier, used in electronics and engineering.
Literally 'strengthening agent', used for chemical or biological boosters (e.g., immune booster).
The president's speech was a morale booster for the employees.
His words are a booster for me.
The booster provides thrust.
Boost the signal with an amplifier.
This supplement works as an immune booster.