Umbrellas keep dry.
Meaning: This means that umbrellas help to keep people dry by protecting them from rain. It's a way to express that umbrellas are useful for staying dry during rainy weather.
Choice of Words: Umbrellas are devices that are used to protect oneself from rain or sun. Keep is a verb that means to maintain or preserve something in a certain state. Dry is an adjective that describes something that is not wet.
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Related Expressions