This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A strongbox.

n. Financial resources; funds.

n. A treasury: stole money from the union coffers.

n. Architecture A decorative sunken panel in a ceiling, dome, soffit, or vault.

n. The chamber formed by a canal lock.

n. A cofferdam.

n. A floating dock.

v. To put in a coffer.

v. Architecture To supply (a ceiling, for example) with decorative sunken panels.

n. A strongbox: a strong chest or box used for keeping money or valuables safe.

n. An ornamental sunken panel in a ceiling or dome.

n. A cofferdam.

n. A supply or store of money, often belonging to an organization.

v. To put money or valuables in a coffer

v. To decorate something, especially a ceiling, with coffers.

n. A casket, chest, or trunk; especially, one used for keeping money or other valuables.

n. Fig.: Treasure or funds; -- usually in the plural.

n. A panel deeply recessed in the ceiling of a vault, dome, or portico; a caisson.

n. A trench dug in the bottom of a dry moat, and extending across it, to enable the besieged to defend it by a raking fire.

n. The chamber of a canal lock; also, a caisson or a cofferdam.

v. To put into a coffer.

v. To secure from leaking, as a shaft, by ramming clay behind the masonry or timbering.

v. To form with or in a coffer or coffers; to furnish with a coffer or coffers.

n. A box, casket, or chest (as now understood, a large chest), especially one used for keeping valuables, as money; an ark; hence, figuratively, a treasury; in the plural, the wealth or pecuniary resources of a person, corporation, nation, etc.

n. In architecture, a sunk panel or compartment in a ceiling or soffit, of an ornamental character, usually enriched with moldings and having a rose, pomegranate, star, or other ornament in the center; a caisson.

n. In fortification, a hollow lodgment across a dry moat, from 6 to 7 feet deep and from 16 to 18 feet broad.

n. A trough in which tin ore is broken to pieces.

n. A kind of caisson or floating dock.

n. A canal-lock chamber.

To deposit or lay up in a coffer: usually with up.

To furnish or ornament with coffers, as a ceiling.

n. a chest especially for storing valuables

n. an ornamental sunken panel in a ceiling or dome

"It's no secret the lion's share of the money in King's campaign coffer comes from the electric industry."

coffered    coffering    coffers   

chest    panel   

caisson    chest    cofferdam    treasury   

offer    reoffer   

treasury    exchequer    casket    sceptre    coronation    urn    brooch    diadem    ingot    sarcophagus