c. 1300, behalve (with dative suffix), "for the sake or benefit, advantage, interest" (of someone), from Old English (him) be healfe "by (his) side," and, incorrectly, from on (his) healfe "on (his) side," from healfe "side" (see half). The word was confused with Middle English behalve, behalves (adv. and prep.) "by the side of, near."
the guardian signed the contract on behalf of the minor child
this letter is written on behalf of my client
spoke a good word in his friend's behalf
campaigning in his own behalf
in your behalf
begrudge
beguile
beguiling
Beguine
begun
behalf
behave
behavior
behavioral
behaviorism
behaviour