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Use "cooley" in a sentence
"Pushing forward, Reno came quickly to a shallow "cooley" (frontierism for gully) that led down through the bluff to the stream."
"Down a little "cooley" some thirty men had made a rush for their lives; the Sioux had simply thronged the banks shooting them as they ran."
"Farther out he can hear hoof-beats and voices, so he edges along westward until he comes suddenly to a depression, a little winding "cooley" across the prairie, through which in the early spring the snows are carried off from some ravine among the bluffs."