Definition of "do-or-die" []

• Requiring supreme effort to avoid the dire consequences of failure: a do-or-die situation. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Then, once they snuck in as the 10th seed and even won their wild card matchup against the Philadelphia Union, Thierry Henry took a shine to the phrase "do-or-die.""
• "Migration for some birds, maybe all, does not seem to be a do-or-die, single-destination journey, but a more leisurely series of shorter flights with stops at known places with good comestibles."
• "It was one of those casual “come-along-for-the-ride” invitations, but we all knew that it was the do-or-die experiment."