The term 'Winter Danger' can be summarized by the crossword solution of 'FLU', which is a contagious respiratory illness caused by influenza viruses. It is most common during the winter months, hence the term 'Winter Danger'. Symptoms of the FLU include fever, chills, cough, sore throat, runny or stuffy nose, muscle or body aches, headaches, and fatigue. Complications of the FLU can include pneumonia, bronchitis, sinus infections, and worsening of chronic medical conditions.