second home

noun

an additional residence, as at the shore or in the country, where one goes on weekends, vacations, and the like.

another residence, as of a close relative or friend, where one spends a great deal of time or feels welcome and at home:

Aunt Sue's house was my second home.

any place where one spends a great deal of time:

My office is my second home.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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