GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Double dealing, double-dealing (?). False or deceitful dealing; acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another. See Double dealing, under Dealing.  Shak.
   
   Syn. -- duplicity.
   
   [1913 Webster + WordNet 1.5]