J'Adoube
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J'Adoube is a French term and an internationally recognised phrase used by chess players, the English translation being "I Adjust".
The phrase gives warning from a player to his opponent that he is about to adjust the position of a chess piece; normally to centralise it on its square. The touched piece rule requires that a warning be given, and whilst this French term is customary, it is not obligatory. A player may adjust a piece only when it is his turn to move.
There have been occasions in chess history when the phrase has been used after making a losing move so that the move could be retracted, thus attempting to sidestep the touch piece rule. Such behaviour is inexcusable and regarded as a blatant attempt to cheat. The Yugoslav Grandmaster Milan Matulovic was nicknamed "J'adoubovic" after such an incident.