in one's behalf

[in one's behalf] or [on one's behalf] {adv. phr.}, {informal} 1.For someone else; in your place.

My husband could not be heretonight, but I want to thank you on his behalf.

2. For the good ofanother person or group; as a help to someone.

My teacher went tothe factory and spoke in my behalf when I was looking for a job.

Compare: IN BEHALF OF, ON ONE'S ACCOUNT.