behalf
UK: bɪˈhɑːf | US: bɪˈhæf
n. interest, support, or benefit (used in phrases like "on behalf of" or "in behalf of")
The word "behalf" originates from Middle English, combining the prefix "be-" (meaning "by" or "about") with "half" (referring to "side" or "part"). Historically, "half" in Old English ("healf") denoted a side or portion, often in a figurative sense. Over time, "behalf" evolved to signify representation or acting for someone's interest, as in "on behalf of," where one takes the "side" of another. The logic reflects a spatial metaphor—standing by someone's "half" (side) to support them.
She spoke on behalf of the entire team.
The lawyer acted in behalf of his client.
He accepted the award on his sister's behalf.
They donated money in behalf of the charity.
The letter was written on my behalf.