Polite form of 酢 (vinegar). Used in everyday polite speech, especially when referring to vinegar as an ingredient or condiment.
I put vinegar on my salad before eating it.
Adding a little vinegar tightens the flavor.
Excuse me, could you pass me the vinegar?
I dressed the cucumbers with vinegar.
At the end, I add a little vinegar to the simmered dish.