Cartel

Part of speech: noun (n.)

1. An agreement between belligerents for the exchange of prisoners. Wilhelm.

2. A letter of defiance or challenge; a challenge to single combat. [Obs.] He is cowed at the very idea of a cartel., Sir W. Scott. Cartel, or Cartel ship, a ship employed in the exchange of prisoners, or in carrying propositions to an enemy; a ship beating a flag of truce and privileged from capture.

Part of speech: verb (v.)

To defy or challenge. [Obs.] You shall cartel him. B. Jonson.