Synonyms of 'behalf'
usage note:On behalf of is sometimes wrongly used as an alternative to on the part of. The distinction is that on behalf of someone means `for someone's benefit' or `representing someone', while on the part of someone can be roughly paraphrased as `by someone'.
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Thesaurus for behalf from the Collins English Thesaurus
interest, part, benefit , or respect (only in the phrases on ( someone's ) behalf , on or US and Canadian in behalf of , in this ( or that ) behalf )