(idiomatic) A person's life, when lost through death in service to a nation or cause, particularly as a member of a military force in war or a semi-militarized organization such as a police force or civil defense corps, e.g. fire departments. May also be applied to some dangerous government and civil occupations such as espionage.

(informal)

plural of lender of last resort

plural of drug of last resort

(finance) The institution in a financial system that acts as the provider of liquidity to a financial institution that finds itself unable to obtain sufficient liquidity in the interbank lending market and has exhausted other possible sources.

(medicine) A pharmaceutical drug that is tried after all other drug options have failed to produce an adequate response in the patient.

die / (uncommon) be defeated

plural of letter of last resort

A handwritten letter from the British Prime Minister to the commanding officers of nuclear submarines, specifying the action to be taken in the event that an enemy nuclear strike destroys the British government.

From beginning to end.