The Online Dictionary definition of corner substantiates that the Biblical term corner need not refer to geometric angular corners.
Note the emboldened definitions (embolding mine for emphasis) which support our claims.
Buz - just a quick question. Why do people say 'the four corners of the earth'? Where did this usage of the word 'corner' come from? I suggest it might be
because of the Bible. Just a thought.
This is just another example of how Biblifobic skeptics of the Biblical record exact upon the Biblical record what they do not exact on other literature or upon themselves in debating the issues.
Is it Bibliphobic to point out that certain phrases that are in the Bible can make it into our common idiomatic speech patterns? After all 'the four corners of the earth' would just be a drop in the bucket. Then again, perhaps the Bibliphobes (people afraid of books?) are sucking down on sour grapes.
Meh - how the mighty have fallen. Fare well - eat, drink and be merry!