节约 (jié yuē) is a verb meaning 'to save' — especially resources like water, electricity, money, or time. The character 节 (jié) means 'to moderate' or 'to restrain', and 约 (yuē) means 'to restrict' or 'to limit'; together, they convey the idea of consciously limiting consumption to avoid waste. It’s commonly used in contexts emphasizing responsibility, sustainability, and frugality — such as environmental education, household management, or government public service campaigns.

This word carries a positive, socially valued connotation and often appears in formal or semi-formal speech and writing. While it can be used alone as a verb (e.g., 我们要节约用水), it also frequently functions as a noun in phrases like 节约意识 ('awareness of conservation') or 节约习惯 ('habit of saving'). It is not typically used for abstract concepts like 'saving face' or 'saving time' in casual speech — for those, other words like 省 (shěng) or 节省 (jié shěng) are more common.