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Definition of Lost in action
1. Adjective. (euphemistic of a military serviceperson) Killed during military combat. ¹
2. Adjective. (context: of military equipment, resources, etc.) Destroyed during military combat. ¹
3. Adjective. (figuratively by extension of persons, things, policies, etc.) Rejected, nullified, incapacitated, or rendered unavailable. ¹
¹ Source: wiktionary.com