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landlord; landlady
house owner; home owner; head of the household
家主に毎月の家賃を払いに行ってきた。
I went to pay the rent to the landlord.
家主の許可なく部屋を改装できない。
You can't renovate without the landlord's permission.
家主との契約を更新することにした。
I decided to renew the contract with the landlord.