Red-hot describes something extremely hot, to the point where it glows red like heated metal in a blacksmith's forge. When iron reaches about 900 degrees Fahrenheit, it literally turns red from the heat. A poker left in a fireplace becomes red-hot, and touching it would cause a serious burn.

The word also means intensely exciting, popular, or competitive. A red-hot debate is one where people argue passionately and emotions run high. A basketball team on a red-hot winning streak seems unstoppable, playing with such intensity that opponents struggle to keep up. A red-hot new video game is one that everyone wants to play the moment it's released.

When something is red-hot, there's an urgency or intensity to it. A detective following a red-hot lead has just discovered crucial information that could solve the case quickly. The phrase captures both literal burning heat and that same feeling of intensity in competition, popularity, or excitement.