Made Cockney in character, speech, or manner; transformed to have Cockney qualities.
From 'Cockney' plus the suffix '-fied' (past participle of '-fy,' meaning to make or cause to be). Parallel to 'modified,' 'classified,' or 'dignified.'
You can see this suffix in action across English—'cockneyfied' shows how we can literally add '-fy' to nearly any noun to create a verb meaning 'to make into that thing'!
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