crabholes

Messages had dribbled through from each part of the attacking line telling exactly where every portion of it had got to; or rather telling where each portion believed it had got to -- as far as it could judge by sticking up its collective head from shell craters and broken-down trench walls and staring out over the limitless sea of craters and crabholes which surrounded it.

Letters from France 1923

At Shady Creek there was nothing for the horses to eat, and beyond it the ground became treacherous and full of crabholes.

The Book of the Bush Containing Many Truthful Sketches Of The Early Colonial Life Of Squatters, Whalers, Convicts, Diggers, And Others Who Left Their Native Land And Never Returned George Dunderdale 1862