Comprehensive resource for understanding and mastering English idioms
The idiom "up in the air" is a figurative expression used to describe something that has not yet been decided or determined, or something that is uncertain or unclear. It can also be used to refer to a situation that is being deliberated upon or discussed. The phrase originates from the idea of a plane flying in the sky, which is an image often associated with the uncertainty and ambiguity of the future.
The phrase "up in the air" dates back to the early 20th century, with its first recorded use appearing in a collection of American sayings in 1917. However, it is unclear where the idiom originally came from, as there are many theories about its origins. Some believe that it was inspired by the uncertainty and instability of the financial market during the stock market crash of 1929. Others think that it may have been influenced by the vagueness of scientific theories or the unpredictable nature of weather patterns.