both barrels

== English == === Etymology === In reference to discharging both barrels of a double-barrelled shotgun simultaneously rather than one at a time. === Noun === both barrels pl (plural only) (informal, figuratively) The maximum damage that a weapon can deliver. === References === “give someone both barrels” (US) / “give someone both barrels” (UK) in Macmillan English Dictionary. “let someone have both barrels”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.