Yes, the phrase ‘over the moon’ is indeed a metaphor. It is used to express a state of extreme happiness or joy. When someone says they are ‘over the moon,’ they are not literally floating above the moon; instead, they are conveying a feeling of exhilaration or excitement.
The origin of this metaphor is thought to date back to the mid-20th century, where it became popular in English-speaking countries. The imagery it evokes suggests a sense of being so happy that it feels as if one has transcended ordinary boundaries, much like how someone might feel if they could soar into the sky.
Overall, ‘over the moon’ reflects a common human experience—celebrating moments of happiness—making it a relatable and vivid metaphor in everyday language.