He is the head of this household.
主の命令には逆らえない。
You cannot disobey the master's orders.
Used for the owner of a shop, business, or property; often implies a long-standing or respected owner.
この店の主はとても親切だ。
The owner of this shop is very kind.
土地の主に許可をもらう必要がある。
You need to get permission from the landowner.
Refers to the person who is the subject of a rumor or the doer of a deed; often used in set phrases like 噂の主.
噂の主は誰なのか気になる。
I wonder who the subject of the rumor is.
そのいたずらの主は弟だった。
The doer of that prank was my younger brother.
guardian spirit; long-time resident
Can refer to a mystical guardian spirit of a place, often an old animal, or to a person who has been in a place or position for a very long time.
この池の主は大蛇だと言われている。
They say the guardian spirit of this pond is a giant snake.
彼はこの会社の主のような存在で、誰も逆らえない。
He is like a long-time fixture in this company; no one can oppose him.
Old-fashioned or dialectal term for one's husband; now mostly replaced by 夫 or 主人.
うちの主はいつも遅く帰ってくる。
My husband always comes home late.
Familiar or old-fashioned second-person pronoun, often used by older men or in period speech; can sound rough or affectionate depending on context.
See also: お主
主もなかなかやるな。
You're pretty good too, aren't you?
お主、名は何と申す?
What is your name, good sir?
It's said that the guardian of this forest is a huge bear.
Everyone wants to know who's behind the rumor.
landowner; landlord; landlady
landlord; landlady · house owner; homeowner; head of household
horse owner; owner of a horse · registered owner (of a racehorse)
Shinto priest; chief priest · Welsh onion (jargon)
employer
savior; rescuer · Messiah; Jesus Christ
borrower; debtor · tenant; lessee; renter
seller; vendor
shipper; consignor
sender; consignor; remitter
lender; creditor; landlord
buyer; purchaser
village headman (Kanto region)
you (dated, to equals or inferiors)
warehouse owner
owner of a mountain · proprietor of a mine
you
territorial ruler (Yamato period)
uploader
original poster; OP; thread starter
tweet author; poster of a tweet
original poster; OP