Comprehensive resource for understanding and mastering English idioms
The idiom "high five" is a gesture or expression used to acknowledge success, congratulate someone, or express enthusiasm. It involves putting one's hand palm-up and slapping it against another person's hand, usually in a friendly manner. The literal meaning of the phrase is to lift one's hand high and give a five o'clock salute, which was used by early aviators who would signal they were ready for takeoff at 5 pm.
The phrase "high five" is believed to have originated in aviation in the early 20th century. Pilots would signal they were ready for takeoff at 5 pm by lifting their hand high and giving a salute. Over time, this gesture evolved into a more casual way of acknowledging success or expressing enthusiasm.