From Longman Dictionary of Contemporary Englishbreathe your last (breath)breathe your last (breath)literaryDIE to die → breathe
Examples from the Corpus
breathe your last (breath)• In the blue light of the morning he breathed his last.• Millions who were dangerously ill or breathing their last.• Five hours more and she'd breathe her last and never know them.• When it looked as though he was breathing his last, Beria's face shone with delight.• Large-scale, publicly-owned enterprises will breathe their last gasp and wither away well before the state which spawned them.• The moment Carey was confident that Elizabeth had breathed her last he was in the saddle, racing for the Border. 