jump out of her skin

[hhtt21]

"Babette is downstairs in bed. She is so nervous she is practically jumping out of her skin."

What does jumping out of her skin ​means?

Source: Love Kills by Dan Greenburg.

 

[andrewg927]

Have you tried looking it up?

 

[Skrej]

Here's a hint to guide your search. It's an idiom.