Shut-in

Shut-in is a hyphenated compound word. A compound word is a word derived from two or more separate words used together to create another word. Compound words are new words that have a different meaning than the definitions of the original words. Compound words are usually composed of two nouns, or an adjective and a noun. […]
from Grammarist
https://grammarist.com/compound-words/shut-in/