What does the word subzero mean?

"Subzero" means below zero degrees. It's typically used when referring to temperatures, specifically when they are below the freezing point of water (0 degrees Celsius or 32 degrees Fahrenheit).

For example:

* "The temperature dropped to subzero last night."

* "The arctic explorer endured subzero temperatures for weeks."

It can also be used more generally to describe something that is significantly lower than a standard or expected value.

For example:

* "The company's profits were subzero for the quarter."

* "The team's performance was subzero."