To give something to someone and get something else from them in return.
Swapping can be a fun way to get something new without spending money.
Examples:
I will swap my toy for your candy.
Let's swap our books.
We can swap our snacks at lunchtime.
I don't want to swap my ice cream for your vegetables!
We can swap our whole lunches and try new foods.
She likes to swap her toys with her friends.