The Collaborative International Dictionary
Water monkey
Water monkey \Water monkey\ A jar or bottle, as of porous earthenware, in which water is cooled by evaporation.
Wikipedia
Water monkey
The Water Monkey is a mythical creature in Chinese folklore. In stories, it is an animal that lives underwater in one of the many lakes of China. The Water Monkey reportedly likes to drag people under the water, sometimes resulting in a drowning death. The tale of the Water Monkey is at times used by adults to keep children from playing in the water.
Usage examples of "water monkey".
Anne examined it and determined that the water monkey had bitten through his glove.