double-dealer

n : a person who says one thing and does another [syn: {double-crosser},

{betrayer}, {traitor}]

double-duplex

(From {telegraphy}) A {full-duplex} link with

two telegraphers (a sender and a receiver) at each end, to

simultaneously transmit in both directions.

Compare: {single-duplex}.

(2000-03-30)