'坐左' is a verb phrase meaning 'to sit on the left' or 'to take the left seat.' It combines the verb 坐 (zuò, 'to sit') and the noun/adverb 左 (zuǒ, 'left'), functioning as a directional complement. Unlike English, Chinese often places direction words directly after verbs without prepositions, so 坐左 implies sitting specifically at the leftmost position or on the left side of a reference point—such as a bench, table, or row of seats.

This phrase is commonly used in everyday instructions, classroom settings, public transport announcements, or family seating arrangements. It’s neutral in register and frequently appears in spoken Mandarin, especially when giving spatial directions. Note that it’s not used for abstract 'left' (e.g., political left); it refers strictly to physical left-side positioning. The phrase may also appear in compound forms like 坐左边 (zuò zuǒbiān, 'sit on the left side'), but 坐左 is more concise and colloquial in northern dialect-influenced speech.