booster

/ˈbuːstə(r)/ (bre, ipa) · [bˈustɚ] /ˈbuːstər/ (ame, ipa) · [bˈustɚ] /ˈbü-stər How to pronounce booster (audio)/ (ame, mw)

booster — noun

  • boostersingular
  • boostersplural

1. a thing that gives extra force, energy, or encouragement so that something works

1.名詞B2
釋義

a thing that gives extra force, energy, or encouragement so that something works better or becomes stronger.

例句

The signal booster stopped the classroom microphone from cutting out.

collocation: signal booster

A short walk outside was a real mood booster after lunch.

collocation: mood booster

同義詞
  • aid

    a broader word for help; it does not always suggest stronger effect or higher energy

  • enhancer

    more technical, often used for products or features that improve quality

  • lift

    often used for a rise in mood or confidence rather than for devices or systems

反義詞
  • hindrance

    something that makes progress harder instead of helping it forward

  • drag

    something that slows growth, energy, or performance

文法句型

[noun] booster

booster for + [quality/system]

用法筆記

Often follows a noun naming what is being increased, as in 'signal booster', 'confidence booster', or 'sales booster'. Use sense 3 for an extra vaccine dose and sense 4 for the rocket part used at launch.

常見錯誤

❌The speech was a good booster to me.
✅The speech was a good booster for my confidence.
💡Use 'for' to name what is being increased, or place the target noun before 'booster'.

2. someone who eagerly praises, pushes, or backs a person, product, team, or idea,

2.名詞C1
釋義

someone who eagerly praises, pushes, or backs a person, product, team, or idea, often to win support from other people.

例句

Talia became an early booster of the mayor's reading campaign.

pattern: booster of + [cause]

Several restaurant owners were vocal boosters of the new night market.

同義詞
  • supporter

    more general and neutral; it does not always suggest public promotion

  • backer

    often stresses money or practical help rather than publicity

  • promoter

    focuses more directly on advertising or spreading praise

  • advocate

    suggests arguing for an idea or policy, especially in public

反義詞
  • critic

    someone who points out faults instead of praising or supporting

  • opponent

    someone who actively resists the same person, plan, or cause

文法句型

booster of + [idea/person/product]

用法筆記

Usually followed by 'of' plus the person, cause, or product being promoted. Compared with 'supporter', 'booster' often adds the idea of enthusiastic publicity and active encouragement.

常見錯誤

❌She is a booster to the plan.
✅She is a booster of the plan.
💡Use 'of' after 'booster' when naming the idea or person being promoted.

3. an added dose given after an earlier one to refresh or extend protection against

3.名詞B1
釋義

an added dose given after an earlier one to refresh or extend protection against a disease.

例句

Hoa got a tetanus booster after stepping on a rusty nail.

pattern: get a booster

The clinic sent text reminders when flu boosters arrived on Monday morning.

同義詞
  • booster shot

    the full everyday phrase; slightly more explicit than 'booster' alone

  • additional dose

    a neutral medical phrase that can refer to many kinds of extra doses

  • top-up dose

    common in health writing that stresses renewed protection

文法句型

get a booster

booster for + [disease]

用法筆記

Most often appears in health news and clinic notices as 'booster' or 'booster shot'. It refers to an additional dose given after the earlier protection has become weaker.

常見錯誤

❌I got my booster vaccine yesterday.
✅I got my booster yesterday.' or 'I got a booster shot yesterday.
💡In everyday use, 'booster' already implies an extra vaccine dose.

4. a rocket unit attached to a spacecraft to supply extra thrust during launch and

4.名詞B2
釋義

a rocket unit attached to a spacecraft to supply extra thrust during launch and the early climb.

例句

The rocket's booster fell into the sea two minutes later.

rocket's booster

Engineers checked the left booster before the launch rehearsal.

launch rehearsal context

同義詞
  • booster rocket

    a fuller phrase for the same launch unit

  • first stage

    close in many rockets, though 'first stage' names the stage position rather than the added-power role

文法句型

booster + on/for + [rocket]

用法筆記

Usually appears with words such as 'rocket', 'stage', and 'launch'. It names the extra power unit, not the whole spacecraft.

常見錯誤

❌The astronauts repaired the booster ship.
✅The astronauts repaired the booster on the rocket.
💡A booster is one launch-power unit, not the whole spacecraft.