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Wiktionary
hungry ghost

n. (context Buddhism Chinese folk religion English) A type of supernatural being, condemned to desire more than it can consume. Often depicted with large belly and tiny mouth.

Wikipedia
Hungry ghost

Hungry ghost is a concept in Chinese Buddhism and Chinese traditional religion representing beings who are driven by intense emotional needs in an animalistic way. The term , literally "hungry ghost", is the Chinese translation of the term preta in Buddhism. "Hungry ghosts" play a role in Chinese Buddhism and Taoism as well as in Chinese folk religion. The term is not to be confused with the generic term for " ghost", (i.e. the spirit of a deceased ancestor). The understanding is that all people become such a regular ghost when they die, and would then slowly weaken and eventually die a second time. Hungry ghosts, by contrast, are a much more exceptional case, and would only occur in very unfortunate circumstances, such as if a whole family were killed or when a family no longer venerated their ancestors.

With the rise in popularity of Buddhism, the idea became popular that souls would live in space until reincarnation. In the Taoist tradition it is believed that hungry ghosts can arise from people whose deaths have been violent or unhappy. Both Buddhism and Taoism share the idea that hungry ghosts can emerge from neglect or desertion of ancestors. According to the Hua-yen Sutra evil deeds will cause a soul to be reborn in one of six different realms. The highest degree of evil deed will cause a soul to be reborn as a denizen of hell, a lower degree of evil will cause a soul to be reborn as an animal, and the lowest degree will cause a soul to be reborn as a hungry ghost. According to the tradition, evil deeds that lead to becoming a hungry ghost are killing, stealing and sexual misconduct. Desire, greed, anger and ignorance are all factors in causing a soul to be reborn as a hungry ghost because they are motives for people to perform evil deeds.