Raincoats keep dry.
Meaning: This means that raincoats are used to maintain or continue a state of dryness, even when it is raining. It's like saying, Raincoats protect the wearer from getting wet in the rain.
Choice of Words: Raincoats are a type of coat worn to protect the wearer from rain. Keep is a verb that means to maintain or continue something in a certain state. Dry is an adjective that describes something that is not wet or moist.
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