do-or-die

The phrase "do or die" originates from a long-standing English proverbial expression, famously crystallized in Robert Burns's 1795 poem "Robert Bruce's March to Bannockburn" with the line "Let us do or die!" It encapsulates a binary, life-or-death logic of ultimate commitment. The construction leverages the fundamental verbs "do" (from Old English dōn, meaning to act or perform) and "die" (from Old English dīegan, dēagan, meaning to cease living) in their most literal sense, joined by the disjunctive "or" to present two starkly opposed outcomes. This literal sense of "either succeed in the action or perish" evolved into a modern attributive adjective describing any situation or attitude characterized by such desperate, final resolve.

This is a fixed, idiomatic compound formed from the common English verbs "do" and "die," connected by the conjunction "or." It functions as a single lexical unit.