cofferdam (Noun) A temporary watertight structure that is pumped dry to enclose an area underwater and allow construction work on a ship, bridge, or rig to be carried out; a caisson.
cofferdam (Noun) An empty space that acts as a protective barrier between two floors or bulkheads on a ship.
cofferdam (n.) A water-tight inclosure, as of piles packed with clay,
from which the water is pumped to expose the bottom (of a river, etc.)
and permit the laying of foundations, building of piers, etc.
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