on behalf of someone

idiom
variants: or on someone's behalf

Definition of on behalf of someone 

1 : as a representative of someone The teacher accepted the award on behalf of the whole class.

2 or US in behalf of someone or in someone's behalf : for the benefit of someone : in support of someone She spoke in behalf of the other candidate. They're willing to do anything on their child's behalf.

3 : because of someone Don't get up on my behalf.

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to make faulty or ineffective

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