in behalf of somebody | in somebody’s behalfidiomPart ofbehalfin behalf of somebody | in somebody’s behalfin behalf of somebody | in somebody’s behalf — idiomidiom1. Doing something to support or help a person or group.1.idiomDefinitionDoing something to support or help a person or group.ExampleMaya collected donations in behalf of the local animal shelter.Aiden spoke in his friend's behalf at the meeting.