flame out verb4 •To fail due to extinction of flame.If on flame out, steam pressure goes below 75# you must go back on gas to return [....] The grievant replied that If he did so, the boiler would flame out. — 1967 •To stop due to exhaustion. •(figurative) To fail, usually spectacularly. •(no longer used) To become suddenly angry; to break out into indignation or similar emotion; to flare up.[O]n being brought home, and giving us ground to suppose he was much worse hurt than he really was, and a fever ensuing, every one flamed out; and all was laid at my door. — 1748 formsflamed out · flaming out · flames out