What is the meaning of bomb?

noun

• An explosive device fused to explode under specific conditions.
• Strong sealed vessel for measuring heat of combustion.
  • synonyms: bomb calorimeter
• An event that fails badly or is totally ineffectual.
  • usage: "the first experiment was a real turkey"; "the meeting was a dud as far as new business was concerned"
  • synonyms: turkey, dud

verb

• Throw bombs at or attack with bombs.
  • usage: "The Americans bombed Dresden"
  • synonyms: bombard
• Fail to get a passing grade.
  • usage: "She studied hard but failed nevertheless"; "Did I fail the test"
  • synonyms: fail, flunk, flush it