bomb

an explosive device fused to explode under specific conditions

strong sealed vessel for measuring heat of combustion

an event that fails badly or is totally ineffectual; "the first experiment was a real turkey"; "the meeting was a dud as far as new business was concerned"

throw bombs at or attack with bombs; "The Americans bombed Dresden"

fail to get a passing grade; "She studied hard but failed nevertheless"; "Did I fail the test?"