"Double-barrel" typically refers to a type of firearm that has two barrels, allowing it to fire two shots in quick succession. This design is often found in shotguns, which are used for hunting and sport shooting. The two barrels can be arranged either side by side or one on top of the other, providing versatility in aiming and shooting. In addition to firearms, the term "double-barrel" can also describe various objects or concepts that feature two parallel components. For example, in the context of marketing, a "double-barrel" approach might involve using two strategies simultaneously to achieve a goal, enhancing effectiveness and reach.