man cave
US /ˈmæn ˌkeɪv/
UK /ˈmæn ˌkeɪv/
1.
a room or space (as in a house) designed to be a secluded haven for a man to pursue hobbies, watch sports, or relax with friends, often decorated with masculine themes or interests
:
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He spent the entire weekend in his man cave, watching football and playing video games.
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The basement was transformed into a perfect man cave with a pool table and a big screen TV.