Across:
   1. To cause someone to feel calm or to feel that they want to sleep
   2. To suddenly or unexpectedly see something, especially something a long distance away
   3. An entertaining activity or sport, especially one played by children

Down:
   1. One of the parts of the body of a human or animal that is used for standing or walking
   2. Short for United States of America
   3. Short for Landau-Pomeranchuk-Migdal effect
   4. A highly alkaline substance, usually either sodium hydroxide or potassium hydroxide, that can cause severe damage or burns and is used in making cleaning products

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