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1.
One who speaks on behalf of another.
Offer support or to take ones place.
"I have come to offer my support on behalf of the king"

"Why have you come?" - "I have come to reason with you on the whole civil rights scenario"

"You are just an messengerboy, an advocate, i refuse to listen till he gains the guts to speak to me himself!
by Jordan99259 June 13, 2006