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do-or-die

[doo-er-dahy]
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adjective
  1. reflecting or characterized by an irrevocable decision to succeed at all costs; desperate; all-out: a do-or-die attempt to halt the invaders.
  2. involving a potentially fatal crisis or crucial emergency.

Origin of do-or-die

First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for do-or-die

do-or-die

adjective
  1. (prenominal) of or involving a determined and sometimes reckless effort to succeed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012