Coop up
Definition 1 of 2
Pro Tip 1/3Negative Feeling
Implies discomfort or desire to escape from confinement. 
The cat did not enjoy being cooped up in the carrier.
Pro Tip 2/3Physical Space
Usually refers to small physical spaces like rooms or buildings. 
The dog was cooped up in a tiny yard for hours.
Pro Tip 3/3Colloquial Usage
Common in everyday English but less appropriate in formal writing. 
He was getting restless from being cooped up at home.