'Zuǒ zhuǎn' literally combines 'zuǒ' (left) and 'zhuǎn' (to turn), forming a compound verb meaning 'to turn left'. It is primarily used in directional instructions—especially in navigation, driving, walking, or giving route guidance. Unlike standalone 'zhuǎn', which can mean 'to rotate' or 'to change', 'zuǒ zhuǎn' specifically indicates a leftward directional change of orientation or movement.

This phrase functions as a verb phrase and commonly appears in imperative sentences ('Please turn left'), future-tense directions ('You will turn left at the next intersection'), or descriptive narration ('He turned left onto the side street'). It is neutral in register—used equally in spoken and written Chinese—and often appears with location complements (e.g., '在路口左转' — 'turn left at the intersection') or directional objects (e.g., '左转90度' — 'turn left 90 degrees').