Wiktionary
vb. 1 (context transitive English) To destroy by blasting explosives 2 (context intransitive English) to continue shooting rapidly.
Usage examples of "blast away".
When she was close enough she'd unmask her batteries and blast away the other vessels' antennas and rigging, leaving them crippled.
Seven minutes to go-Pemberton flipped the switch permitting the robot-pilot to blast away when its clock told it to.
Made of three- to seven-meter high ridges meandering randomly in any and all directions-as well as the various wind-carved gulleys and arroyos Separating them-the maze had been considered too great an obstacle to blast away.
And the angle must have been oblique enough to direct the back blast away from him.
The pirate and the cruiser continued to blast away even as they touched the bottom of their parabola and veered upward toward the sky.