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Two guys are arguing while third are coming to them and said to one of them:

Why don't you shut your mouth before I close it for good.

It's not clear what for good emphisize here? Couldn't you explain?

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    Related: english.stackexchange.com/questions/40771/…
    – user230
    Commented Apr 4, 2015 at 14:04
  • @snailboat So this is an idiom. Is that idiom and the word forever replacable with each other? Commented Apr 4, 2015 at 14:22
  • Not really. A good answer should explain how it's used. You could also say permanently here, I think.
    – user230
    Commented Apr 4, 2015 at 14:45

1 Answer 1

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"For good" is an idiomatic reference that means "permanently." The emphasis is intended to convey that the third party is threatening harm to one of the other speakers, eg "to close his mouth permanently" through some sort of violence or mayhem.

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