He had assumed a stage Southern accent.
What does 'a stage Southern accent' mean, especially 'stage' in this case? Is it an adjective?
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It's not a real southern accent. Either the speaker isn't good at mimicking the accent or perhaps the speaker has adopted a generalized unspecific accent (perhaps deliberately, as an actor might, so as to avoid implying too specific a place).
Stage is an attributive noun here, denoting a theatrical context.
The world of a play (or film) is not the same as the actual world. Hence the notion of stage dialects. We use slightly artificial accents because the real thing would be distracting or incomprehensible. If we Americans watched a production of The Importance of Being Earnest with Ms. Woolf’s accent, it would drive us toward the exits in about fifteen minutes. Source
Basically it's a modified southern accent. "Stage" refers to the "world" of film, movies etc.