be·half (b-h f, -häf) n. Interest, support, or benefit. Idioms: in behalf of. For the benefit of; in the interest of. on behalf of. As the agent of; on the part of.
Idioms. 1. in or on behalf of, as a representative of or a proxy for: On behalf of my colleagues, I address you tonight. 2. in or on (someone's) behalf, in the interest or aid of ...