a sheltered and secluded place
"After a long day of hiking, we found our favorite nook tucked away behind the old oak tree to enjoy some quiet tea."
A small corner formed by two walls; an alcove.
"She tucked her favorite book into a cozy nook behind the radiator where sunlight pooled all afternoon."
To withdraw into a nook.
"After the storm, she retreated to her favorite nook in the library to read quietly."