on behalf of

IPA/ˌɒn bɪhˈɑːf ɒv/
IPA/ˌɔn bᵻhˈæf ʌv/

on behalf of — idiom

1. doing something as the official agent for another person or group, so that what

1.慣用語B2
釋義

doing something as the official agent for another person or group, so that what you do or say counts as theirs

例句

Antonia signed the rental contract on behalf of her elderly father.

on behalf of + person, acting as their agent

The lawyer spoke on behalf of all three families during the court hearing.

同義詞
  • representing

    more neutral; states the role without the formal 'speak/act for' frame

  • in the name of

    stresses using someone's authority or identity

文法句型

on behalf of + person/group

用法筆記

Object is usually a person, group, or organisation that the speaker formally represents. Distinguish from sense 2: here the focus is acting AS the agent, not acting FOR someone's gain.

常見錯誤

I am writing in behalf of the manager.
I am writing on behalf of the manager.
💡for the 'acting as agent' meaning, British and standard usage prefers 'on behalf of'.

2. in order to help someone or to support a cause that you care about

2.慣用語B2
釋義

in order to help someone or to support a cause that you care about

例句

Ayesha raised over a thousand dollars on behalf of children with no clean water.

on behalf of + cause, for its benefit

Neighbours started a petition on behalf of the families losing their homes.

同義詞
反義詞
  • against

    opposing rather than helping

文法句型

on behalf of + person/cause

用法筆記

Subject acts to help or defend the object, who gains from the action. Distinguish from sense 1: the doer here is not the object's official agent, just a supporter working for their good.

3. as a result of what someone has done, or in order to make a particular person ha

3.慣用語C1
釋義

as a result of what someone has done, or in order to make a particular person happy

例句

On behalf of his late grandmother, Jin kept the little bakery open every morning.

on behalf of + person, doing it for their sake

Élise learned to cook the old recipes on behalf of her homesick mother.

同義詞
  • for the sake of

    very close; stresses doing it to please or honour someone

  • in honour of

    used when the person is being remembered or celebrated

文法句型

on behalf of + person

用法筆記

Marks the person whose wish or memory motivates the action, rather than one who directly gains from it. This sense is the rarest and shades into sense 2 when the person also benefits.