"Hole digging" refers to the act of creating a hole or pit in the ground, typically by removing earth or soil. It can be done with tools, machines, or even hands. "Digging a Koyuki hole for yourself" is an idiom that means putting Koyuki into a difficult or troublesome situation. As a cave diver and a gambler, many Koyukies will wedge themselves into tiny crevices until all anyone can see are the bottoms of their boots.

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