noun

caisson

caisson

They used a caisson to build the bridge foundation.

They used a caisson to build the bridge foundation.

((a/the)) caisson a watertight chamber They used a caisson to build the bridge foundation.

Synonyms: coffer, chamber, box

From French 'caisson', meaning 'large box', a diminutive of 'caisse' (case, box).

Think of a giant 'case' or box that is sunk underwater for construction work.

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