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This is a diagram of a four-way intersection of two paths. Corners A and D (or B and C) are:
1. Kitty-corner
2. Catty-corner
3. Something else
I usually say #1, but apparently #2 is better etymologically (from Old French catre, four).
(note to self: need icon for "curious")
eta: I wonder if this is related at all to cattywampus (which I would have spelled caddywompus). Wiktionary seems to think so since it links to cater-corner as a "see also".