This isn't a question at least I don't think it is
Omniscient is a literary technique of writing narrative in third person in which a narrator knows the feelings and thoughts of every character in the story.
Will not
hope it helps ya :D
Answer:
Idiom
Explanation:
"Her heart sank" is an idiom. An idiom is a figure of speech that is a commonly used phrase but can't be interpreted literally.
