- Clandestine cooperation conducted to gain an advantage - Secret agreement - A secret agreement and cooperation for a fraudulent or
deceitful purpose; a playing into each other's hands; deceit; fraud;
cunning. - An agreement between two or more persons to defraud a
person of his rights, by the forms of law, or to obtain an object
forbidden by law.
- Engage in plotting - Plot together - Work together on defective cop siren - To make an agreement, esp. a secret agreement, to do
some act, as to commit treason or a crime, or to do some unlawful deed;
to plot together. - To concur to one end; to agree. - To plot; to plan; to combine for.