The notion that for every wrong done there should be a commensurate justice, instead of wholesale retribution. From the Code of Hammurabi. Hammurabi was King of Babylon, 1792-1750BC. The code...
Its as same as tits for tats.... that you believe if someone does something wrong, they should be punished by having the same thing done to them
Keep watch on.
you noticed something
well it stnds for a give a watch on him or someone..