In behalf, they argue, is used when the meaning is in the interest of someone else, but on behalf is used when speaking for someone. For example, a medical decision would be made in behalf of the patient, and you would speak on behalf of your family. The reality is that on behalf is typically used for both meanings.

Is it on behalf of or on the behalf of?

A: Both expressions are correct, but they mean slightly different things. I discuss this in my book Woe Is I. “In behalf of” means “for the benefit of” or “in the interest of.” “On behalf of” means “in place of” or “as the agent of.”

What does it mean to be on behalf of?

Definition of on behalf of someone

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.