When combined, 左 (zuǒ - left) and 转 (zhuǎn - turn) literally form the phrase “left turn.”
While 左转 (zuǒzhuǎn) is a straightforward directional term, its usage is deeply embedded in the practicalities of modern Chinese life. In China's bustling, and often complexly laid-out cities, being able to give and receive clear directions is a critical skill. Unlike in some Western cultures where directions might be given relative to landmarks (“turn left after the big red church”), Chinese directions are often more direct and imperative, especially when speaking to a taxi or Didi (ride-sharing) driver. The phrase “前面路口左转” (qiánmiàn lùkǒu zuǒzhuǎn - “Turn left at the intersection ahead”) is something you will hear and use constantly. The rise of GPS and navigation apps has only increased the importance of this term. Your phone's navigation will announce “左转” frequently, and you'll need to relay these instructions to your driver. Mastering this term is a key step from being a passive passenger to an active navigator in China. It's also important to note that while “a left turn” in English can have political connotations (e.g., “the country took a left turn”), 左转 (zuǒzhuǎn) is almost exclusively used in its literal, navigational sense in daily conversation. The political concept is usually expressed with the more specific term 左倾 (zuǒqīng - left-leaning).
左转 (zuǒzhuǎn) is primarily used in the context of movement and navigation. Its connotation is neutral and its formality depends on the overall sentence.