behalf

in behalf of someone and in someone's behalf; on behalf of someone; on someone's behalf; in someone's name

[doing something] as someone's agent; [doing something] in place of someone; for the benefit of someone. I'm writing in behalf of Mr. Smith, who has applied for a job with your company. I'm calling on behalf of my client, who wishes to complain about your actions. I'm calling in her behalf. I'm acting on your behalf.

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take up the cudgels for somebody/something   (British & Australian) also take up the cudgels on behalf of somebody/something (British & Australian)

to argue strongly in support of someone or something

Usage notes: A cudgel is a short, heavy stick which is used as a weapon.

Relatives have taken up the cudgels for two British women accused of murder. (British & Australian)

See also: take, up

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on behalf of somebody also in behalf of somebody

for the benefit or support of someone A team of lawyers sued the company on behalf of the workers who lost their jobs.