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'.
コロナワクチンの追加接種を受けました。
I received a COVID vaccine booster.
Commonly used in news and official contexts, combining the loanword 'booster' with 'inoculation'.
ブースター接種の予約が始まりました。
Reservations for booster shots have started.
The loanword by itself is widely understood in context, especially in casual conversation.
来月、ブースターを打つ予定です。
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'.
この成功は大きな自信をつけるものになった。
This success was a big confidence booster.
Used for morale boosters in team or organizational contexts. 'Something that raises morale'.
社長のスピーチは社員の士気を高めるものだった。
The president's speech was a morale booster for the employees.
Literally 'vitality agent', sometimes used figuratively for an energy or motivation booster. Can sound like a supplement.
彼の言葉が私にとっての活力剤だ。
His words are a booster for me.
A rocket engine used to provide extra thrust during launch.
The standard term in aerospace contexts, directly borrowed from English.
ロケットのブースターが分離した。
The rocket's booster separated.
Literally 'auxiliary rocket', used in technical descriptions.
補助ロケットが推力を提供する。
The booster provides thrust.
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.
Wi-Fiブースターを設置した。
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).
このサプリは免疫強化剤として働く。
This supplement works as an immune booster.
信号を増幅器で強くする。
Boost the signal with an amplifier.