( BrE ) ( NAmE ˌdouble-ˈbarreled ) adjective [ usually before noun ]
1.
( of a gun ) having two barrels (= places where the bullets come out)
2.
( BrE ) ( of a family name ) having two parts, sometimes joined by a hyphen, for example 'Day-Lewis'
3.
( of a plan, etc. ) having two parts, and therefore likely to be effective