What does "cool" mean here?
"Cool" is a great adjective to know because it is appropriate to use in many different casual situations. It can be used to say that something is nice, good, trendy, or looks great. Ex: This shirt looks really cool (great). Ex: I like BlackPink. They have a cool (trendy, nice) sense of style. It can also be used as an expression of agreement, like "sure" or "okay." Ex: A: Is it okay if we meet tomorrow instead of today? B: I'm cool with that. (I'm okay with that.) Ex: A: Ross is coming over today. B: Cool. (Sure.)