What does it mean when an actor's role in a film is "post production"?

Question

Post production is editing / special effects / sound effects etc, right? What role does an actor have in that?

Answer 1

An actor can overdub his lines for a variety of reasons. Maybe the words were hard to understand. Maybe there was a sound that interfered with the dialogue. Maybe the director wants to change the emphasis of a certain line. I'm sure there are other reasons that I can't think of, at the moment.

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Answer 2

Often voice work for dubbing in a different language than the actor speaks natively. In the past couple decades it could have something to do with special effects And green screen. Movies and TV shows are often composed of layers upon layers with very little actually being shot all at once.

Answer 3

I heard that most lines are redubbed in post production, not to mention dubbing swear words for television, foreign markets, reshoot scenes. Why wouldn't actor have role in post production, we're hardly experts in how movies are made, I'm sure.