what does the red mean?

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Across
  1. 2. a shape for boxes of chocolates
  2. 4. a queen or a king, a prince or a princess
  3. 6. a person who tavels on foot
Down
  1. 1. typical present on Valentine's day
  2. 3. it's what you put on the floor under all the furniture
  3. 5. it's what Red Cross do
  4. 7. red light on traffic lights tells you to stop