Save water.
Meaning: This means to take action to conserve water and to avoid wasting it. It's like saying, Turn off the tap when you're not using it.
Choice of Words: Save means to keep something safe or to avoid wasting it. Water is a vital resource that is essential for life on earth. When you put them together, "Save water" means to take action to conserve water and to avoid wasting it.
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Related Expressions