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"minor non-speaking role," 1902, theatrical slang. Meaning "actor who has such a part" is attested from 1946. The sports team sense is recorded from 1974.
Persons who are injured, esp in a psychological or spiritual way, but still functional; depressed people: by the end of the year the salesmen are ''walking wounded'', just plain going bonkers
[1960s+; fr a WWI military medical term for a wounded person who is ambulatory]