From Longman Dictionary of Contemporary Englishdo or diedo or dieDETERMINEDused to say that someone is determined to do something very brave or dangerous even if they die attempting it → do
Examples from the Corpus
do or die• From now on it was do or die.• No words, no threats, no waste of energy, just a grim determination to do or die.• It was do or die for me.• I learnt in the South Bronx and the way you're taught there is a do or die situation.do-or-dieˌdo-or-ˈdie adjective [only before noun] DETERMINEDvery determined a do-or-die attitudeExamples from the Corpus
do-or-die• This do-or-die attitude clashes with the caution advocated by the naive inductivist.• That do-or-die Davy Blooming Crockett spirit.• I was very dismayed that I couldn't enjoy swapping ideas with Brian any more without things turning into a do-or-die debate.• The airline spent $120 million in a do-or-die effort to save the company.• Besides, his own party's do-or-die tendency will now be vigilant against any hint of gradualism. 