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1.
One who protects his Brother from the world, and other people.

The Big Brother or the family.

The one who people question when his brother(s) mess up.
Guy: Where is that little bro of yours.

Big Bro: Why

Guy: He needs to explain why he was short on his money.

Big Bro: Ill answer for him.

Guy: Who he hell are you?

Big Bro: My Brothers Keeper.
av Brothers Keeper ninja 30 januari 2010
 
2.
I keep my promises
Im my brother's keeper, i keep my promises.
av DMXbitch 8 september 2008