Definitions for quaker gun
Random House Webster's College Dictionary
a dummy gun, as on a ship or fort: so called in allusion to the Quakers' opposition to war.
Origin of Quaker gun:
a dummy gun or piece of artillery made usually of wood
A nonfunctional imitation of a gun or of a piece of artillery, typically made of wood and usually intended to deceive enemy forces into overestimating one's available firepower.
Origin: An allusion to the pacifism associated with practitioners of the Quaker religion.