高手 literally means 'high hand'—a metaphorical expression where 高 (gāo, 'high') suggests exceptional level or skill, and 手 (shǒu, 'hand') refers to a person who performs an action, especially with physical or technical dexterity. Together, they form a noun meaning 'expert' or 'master'—someone highly skilled in a particular field, whether it's martial arts, cooking, chess, programming, or even video games.

The term carries positive connotations of respect and admiration, often implying years of practice and deep understanding. It’s commonly used in informal and semi-formal speech, especially when praising someone’s ability or acknowledging their authority in a domain. While it can refer to professionals, it’s also frequently applied playfully or humorously to friends who excel at everyday tasks—like a 'coffee-making高手' or a 'noodle-soup高手'.