demurrage (n.)

"any detention of a vessel by the freighter in loading or unloading beyond the time originally stipulated" [Century Dictionary], 1640s, from Old French demorage, from demorer "to stay, delay, retard," from Latin demorari "to linger, loiter, tarry," from de- (see de-) + morari "to delay," from mora "a pause, delay" (see moratorium). Also "a payment in compensation by the freighter for such a delay."