Plural of demurrage: charges paid when a ship, vehicle, or container is kept longer than the allowed time for loading or unloading.
From demurrage (late 16th century), from Old French demourer meaning 'to delay' or 'remain,' from Latin demorari (de- 'away' + morari 'to delay'). The suffix -age forms nouns indicating a charge or fee.
Shipping companies use demurrage charges as a financial penalty to keep goods moving through ports efficiently—it's basically a fine for hogging the equipment! This practice is why container ships spend as little time as possible sitting in port; every extra day costs money.
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