in behalf of

in behalf of idiom
    Also, on behalf of.
  1. For someone else, as someone's agent or representative. For example, In behalf of the board, I want to thank you for your help, or Joan was speaking on behalf of the entire staff. [c. 1300]
  2. For someone's benefit or interest, as in He was collecting the dues in my behalf. [Late 1500s] Some authorities insist that in behalf of be used only to mean “for someone's benefit” and on behalf of only to mean “as someone's agent.” In practice, however, the terms are so often used interchangeably that this distinction no longer has a basis.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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