Laws are essentially certain rules put in place by our government. You must comply with the law or you will face consequences. Some examples of laws are DUI, Murder, Theft, and the many, many Traffic Laws. Everyone knows that you can't drive under influence, you cannot commit murder, you cannot steal, and you must not violate any traffic laws.
I hope this is the answer you're looking for.
Answer: worn by long exposure to the atmosphere; weather-beaten.
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