(British, informal) An ordinary member of the public who intervenes, often at personal risk, to stop a troublemaker, hooligan or ne'er-do-well in the act of committing a crime.
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UK and Irish slang — Cockney, Scouse, Geordie, Yorkshire, Glaswegian, Brummie, Welsh, West Country, plus Irish English. Centuries of regional dialects feeding into modern British and Irish street talk.
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