Spin A Yarn

What does the idiom “Spin A Yarn” mean?

Definition:

Tell a story

For example:

“Sophia spun a long yarn about missing the bus, getting caught in traffic, and having to visit a sick friend, but I think she just overslept.”

Notes:

You can also use “yarn” by itself to mean a story. Both of these are slightly old-fashioned but still in use.