1.
Red-hot metal or rock has been heated to such a high temperature that it has turned red.
...red-hot iron.
ADJ : usu ADJ n
2.
A red-hot object is too hot to be touched safely.
In the main rooms red-hot radiators were left exposed.
ADJ
3.
Red-hot is used to describe a person or thing that is very popular, especially someone who is very good at what they do or something that is new and exciting. ( JOURNALISM )
Some traders are already stacking the red-hot book on their shelves.
ADJ : usu ADJ n