Soil moist.
Meaning: This means that the soil should be slightly wet to provide moisture for plants to grow. It's like saying, The soil should have some water in it.
Choice of Words: Soil is the loose material on the surface of the earth in which plants grow. Moist means slightly wet. When you put them together, "Soil moist" means that the soil should have some water in it to help plants grow.
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Related Expressions