a treasury, as of a state or nation.

(in Great Britain)

( often initial capital letter ) the governmental department in charge of the public revenues.

(formerly) an office administering the royal revenues and determining all cases affecting them.

( initial capital letter ) Also called Court of Exchequer. an ancient common-law court of civil jurisdiction in which cases affecting the revenues of the crown were tried, now merged in the King's Bench Division of the High Court.

Informal . one's financial resources; funds

I'd love to go, but the exchequer is a bit low.