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Definition of Lost cause
1. Noun. A defeated cause or a cause for which defeat is inevitable. 
Definition of Lost cause
1. Noun. (idiomatic) A cause, attempt, or effort that is hopeless or futile. ¹
¹ Source: wiktionary.com
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1. Noun. A defeated cause or a cause for which defeat is inevitable. 
1. Noun. (idiomatic) A cause, attempt, or effort that is hopeless or futile. ¹
¹ Source: wiktionary.com