Hello and welcome.
Today it's cool and rainy in Tokyo.
Our idiom for today is keep an eye on... something.
This means to closely watch something or someone.
Would you please keep an eye on my bag while I go to the bathroom?
We'll have to keep an eye on our investment. If it drops too much, then we'll have to sell.
I'll have to keep an eye on the steaks. I don't want to burn them like I did last time.