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From TheFreeDictionary, pushing somebody over the edge is defined as:

If an unpleasant event pushes someone over the edge, it makes them start to behave in a crazy way.

Can crazy here be to mean all of the following: non-sensible/stupid, very angry, and mentally ill/insane?

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@Theo- Yes it can. – Jim Dec 24 '12 at 19:02
Yes, all of the above, and more. The UP/DOWN metaphor is quite vivid. – John Lawler Dec 24 '12 at 19:05
up vote 4 down vote accepted

Pushing somebody over the edge alludes more to a loss of control which might then be manifested via anger, insanity etc. I'm not sure that stupidity is necessarily associated with it. But I suppose irrational decisions could well be categorised under stupidity ...

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