When temperatures are between 40 degrees and 60 degrees Fahrenheit (five to 15 degrees Celsius), we say it’s cool outside.
It’s a little cool outside. You’ll need a jacket.
Many people around the world like cool, dry weather.
In the United States, the weather usually gets cooler as you head north.
The weather starts to cool off in the fall. (This sentence uses "cool" as a verb.)
This word is very popular as an adjective to describe things that are interesting, fun, popular, or new:
Jose is wearing a really cool jacket.
That movie we saw last night was so cool.
Everyone says that Mr. Jones is a cool teacher.
He’s so cool!
That’s so cool!
He’s a cool cat!
There are many different ways to use this word:
This soup is too hot. It needs to cool off a bit. (cool off = decrease in temperature)
Rena was cool to the idea of working late. (She didn’t want to do it.)
Tom lost his cool during the meeting. (He got mad. The word "cool" is a noun in this sentence.)
Try not to lose your cool. (Try not to get mad.)
We’ve decided to cool it for awhile. Things were getting too intense. (cool it = reduce activity)
Cool it! (Stop fighting.)
I told my boss I needed some vacation time and she was cool with that. (cool with = okay)
Are you cool with this? (Is this okay?)
Note: The word "cool" is very popular to describe things, people, and ideas that are new and interesting. It started as a slang word, but now it’s used by just about everybody. It’s a good word to learn about.