(someone) is talking up a storm

This is a casual expression that means to talk a lot. 

You can use it to talk about young children who start talking a lot once they reach a certain age. Here are some other expressions that use "___ up a storm":

Mom would always be in the kitchen, cooking up a storm while we played in the yard.

You should have seen him at the wedding. He was dancing up a storm!

This phrase appears in these lessons: