A hot sandwich is a type of sandwich that is usually served warm and often contains melted cheese. The two crossword solutions for the term 'hot sandwich' are 'MELT' (4 letters) and 'Reuben' (6 letters). The term 'MELT' refers to a type of sandwich that typically has melted cheese, while the term 'Reuben' refers to a specific type of hot sandwich that is made with corned beef, Swiss cheese, sauerkraut, and Russian dressing.