Definition of coffering:
(n) :
A strong chest or box used for keeping money or valuables safe.
(n) :
A supply or store of money, often belonging to an organization.
(n) :
(architecture) An ornamental sunken panel in a ceiling or dome.
(v) :
(transitive) To put money or valuables in a coffer
(v) :
(transitive) To decorate something, especially a ceiling, with coffers.
(n) :
A cofferdam.