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English definition of “cofferdam”

cofferdam

noun [C]     /ˈkɒf.ə.dæm/ US  /ˈkɑː.fɚ-/ specialized
a large box filled with air that allows people to work underwater, for example while building bridgesGeneral and miscellaneous containersBridges
(Definition of cofferdam noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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