eat one's gun

Meanings:

• 1.

  United StatesUnited Kingdomraredatedinformal
  • (Rare, historical) To be killed by one's own firearm or to commit suicide using one's own gun.

• 2.

  United StatesUnited Kingdomrarefigurative
  • Figuratively, to be undone, harmed, or confounded by one's own means, plans, or devices.