The idiom "be all up" does not have a well-documented origin, but it is possible that it originated from the phrase "all is up" or "all is up with," which was used in the early 19th century. The term "up" in this context refers to the completion or conclusion of something. Over time, the phrase evolved into "be all up," meaning to be completely or nearly finished. It is often used to describe a situation or endeavor that has reached its final stages or is on the verge of completion.

Définition et signification de « be all up » en anglais

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