Definition of blow up

The phrase "blow up" originally referred to the process of inflating something, like a balloon or an air mattress, by blowing air into it. However, over time, the meaning of the term has evolved to also include the idea of expanding or enlarging something beyond its normal size, particularly in a negative or destructive sense. In the context of photography, the phrase "blow up" refers to enlarging a small, seemingly insignificant detail of an image to reveal hidden information or consciousness. This usage originated in criminal investigations in the early 20th century, when detectives would enlarge small sections of photographs to look for clues or evidence. However, over time, "blow up" has come to mean something different in a figurative sense. In particular, the term is used to describe situations where things spiral out of control or become excessively large, often with negative connotations. For example, "The situation blew up in his face" refers to a situation getting out of hand and causing significant harm or damage. In summary, the origin of "blow up" refers to the act of inflating or enlarging something, but its modern usage has expanded to convey a range of meanings, from literal enlargements in photography to figurative expressions of escalation and destruction.