Definitions
1.NounA strong chest or box used for keeping money or valuables safe.
2.NounAn ornamental sunken panel in a ceiling or dome.
3.NounA temporary watertight structure used during underwater construction of bridges, causeways, ships, etc.
4.NounA supply or store of money, often belonging to an organization.
5.NounA trench dug in the bottom of a dry moat, and extending across it, to enable the besieged to defend it with raking fire.
6.VerbTo put money or valuables in a coffer
7.VerbTo decorate something, especially a ceiling, with coffers.