Wiktionary
vb. (context military English) To load cannons with twice the shot, for increased damage at the expense of range.
Wikipedia
Double-Shot is an album by jazz trumpeter Chet Baker and the Mariachi Brass recorded in 1966 and released on the World Pacific label.
Usage examples of "double-shot".
Corpses sprawled in the scuppers who had been caught by the double-shotted six-pounders, and others who had been running to repel boarders when the swivels had scoured the decks with their murderous canister shot.
Char translated this for the confused counterperson, and they ended up taking a pair of regular double-shot tails to a booth in the back.
You make Dick Cheney on tranqs look like Robin Williams on double-shot espressos!
The victorious cavalry charged on to the crossroads where the newly arrived artillery greeted them with double-shotted barrels, and the infantry battalions waited in square, and thus it was the Frenchmen's turn to die.
Every gun was double-shotted, some of the round shot struck between wind and water as the Englishman heeled toward us, and more than one triple charge of grape swept her waist.
That cavalry had been held deep in the valley's floor, safe from the double-shotted British cannon, but now the left flank guard saw a line of enemy redcoats deployed in the rye.
He double-shot ted her dainty cannon, stoked her fireplace, rattled her timbers and finally placed a large fruit cake to bake in her hot little oven.
If you're reading these consecu- tively, Ellison follows Ballard like a double-shot of Jack Daniel's after a whisky sour.