One who practices double dealing; a deceitful, trickish person; a person who says one thing and does another. L'Estrange. Syn. -- double-crosser, betrayer, traitor. [ 1913 Webster + WordNet 1.5 ]
[うちまたこうやく;うちまたごうやく, uchimatakouyaku ; uchimatagouyaku] (n) double-dealer; fence-sitter; timeserver; moving back and forth between two sides in a conflict; duplicity; turncoat