Dictionary

do–or–die

adjective \ˈdü-ər-ˈdī, -r-\

: very determined

—used to describe a situation in which you have to do something or you will fail, lose, etc.

Full Definition of DO-OR-DIE

1
:  doggedly determined to reach one's objective :  indomitable
2
:  presenting as the only alternatives complete success or complete ruin <a do–or–die situation>

First Known Use of DO-OR-DIE

1873

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