[kəˈsuːn], (Noun)

Definitions:
- a large watertight chamber, open at the bottom, from which the water is kept out by air pressure and in which construction work may be carried out under water

- a chest or wagon for holding or conveying ammunition


Phrases:

Origin:
late 17th century: from French, literally ‘large chest’, from Italian cassone, the spelling having been altered in French by association with caisse ‘case’