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melon hole
a lumpy hole found in black soil country caused by expansion and contraction of the soil with changing water content - mostly Central Queensland: That paddock is full of melon holes I nearly broke my axle driving across it.
Contributor's comments: Everyone living in the Tara shire has encountered Melon holes and that is the accepted name for it. There are a few reasons why it is believed to be called melon hole, but most don't ask.