cops short for coppers
from the latin "capper" (or is it "cappre") meaning "to capture"

Rozzer, from Robert (metropolitan police force founded by robert peel) in the same way that baz comes from barry or barney and whatnot
( VampireMonkeyOnSpeed sensible shirt, tie, neatly combed hair etc, Wed 3 Mar 2004, 15:02, archived)

go to quinion.com - every term is explained there
(see above)
( Enigmatic ™                 Voice No More                  ©, Wed 3 Mar 2004, 15:03, archived)

I'm rather impressed by all this.
Well done, all of you.
( monster munch probably your elder, almost certainly your better, Wed 3 Mar 2004, 15:04, archived)