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What Chicago mobsters and wanna-bes say when referring to someone who is privy to or has inside knowledge of mob business. Such individuals are said to be "on the know." It means basically the same thing as "in the know" but only in reference to rackets.
Guy #1: Hey buddy, how about 'dem guyz on Grand Avenue that know da mare's kid?

Guy #2: 'dem guys are on the know.

Guy #3: Good, good.
by Davey Gagunga April 07, 2011
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