1. giving shelter or refuge to someone, especially someone wanted by the law
Usage: often used in legal or formal contexts
2. holding or keeping a thought, feeling, or grudge in one's mind
Usage: commonly used with negative emotions
3. providing a place where something unwanted can live or develop
Usage: often used with diseases, pests, or parasites

Examples

• The family was accused of harboring a fugitive in their basement.
• She has been harboring resentment toward her former business partner for years.
• The old building was harboring rats and other rodents.
• He is harboring doubts about whether he made the right decision.
• The stagnant water was harboring dangerous bacteria.
• They were harboring hopes of winning the championship this season.