oil slick
US /ˈɔɪl slɪk/
UK /ˈɔɪl slɪk/

1.
macchia di petrolio, chiazza di petrolio
a layer of oil floating on water, especially one that has leaked from a ship or been discharged as waste
:
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The environmental disaster was caused by a massive oil slick from the tanker.
Il disastro ambientale è stato causato da un'enorme macchia di petrolio dalla petroliera.
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Birds covered in an oil slick are a tragic sight.
Uccelli coperti da una macchia di petrolio sono uno spettacolo tragico.