See here, the meanings of the word coffer, as video and text. (Click show more below.) coffer (noun) A strongbox: a strong chest or box used for keeping money or valuables safe. coffer (noun) A cofferdam. coffer (noun) A supply or store of money, often belonging to an organization. coffer (noun) A trench dug in the bottom of a dry moat, and extending across it, to enable the besieged to defend it with raking fire. coffer (verb) To put money or valuables in a coffer. coffer (verb) To decorate something, especially a ceiling, with coffers. Reference: coffer February 13, 2019 Please support us with your SUBSCRIPTION!