It is similar to the Latin phrase "Annus Terribilis". It is a way of designating in Latin the disastrous or preferred years to forget about tragic events in ever since the history of a country or the world. It means "Horrible Year", "Terrible Year", by catastrophic year extension or chaotic year. One of this years was for England 1666, year in which plagues and fires occurred in London. For Native American communities it could be for example 1492. when the conquerors arrived. For our future it could be 2020, because of the pandemic we currently live in.
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