Definition of "Harbor" :

noun: a place of refuge and comfort and security

noun: a sheltered port where ships can take on or discharge cargo

verb: maintain (a theory, thoughts, or feelings)

"Harbor a resentment."

verb: hold back a thought or feeling about

"She is harboring a grudge against him."

verb: keep in one's possession; of animals

verb: secretly shelter (as of fugitives or criminals)