Translation guide
How to express the idea of 'opening up' in Japanese, covering physical opening, emotional openness, and starting new opportunities.
To open a door, window, container, etc.
Transitive verb meaning to open something. Used for doors, windows, boxes, etc.
Please open the window.
He opened the door.
Intransitive verb meaning something opens by itself or is in an open state. Used when the subject is the thing that opens.
Do not use 開く (ひらく) when you are the one opening something; use 開ける (あける) instead.
The door opened.
Another reading of 開く, used for abstract or figurative opening, like opening an event or a book. Also used for flowers blooming.
The store opens at 9.
To share feelings, become more communicative, or stop being reserved.
Literally 'open one's heart', meaning to open up emotionally, trust someone, or share true feelings.
She gradually opened up to me.
It's important to open up to friends.
To become relaxed and open with someone, often after initial formality. Implies a warm, friendly atmosphere.
To say one's true feelings or real intention, as opposed to 建前 (tatemae, public facade).
He rarely opens up about his true feelings.
To begin a new opportunity, make something accessible, or initiate an activity.
To open up new land, a market, or a field; to pioneer or develop.
We need to open up new markets.
Literally 'open a path', meaning to pave the way or create an opportunity.
To open up to the public, release restrictions, or make freely available.
The park was opened up to the public.
開ける (あける) is transitive: someone opens something. 開く (ひらく) is intransitive: something opens. 開く (あく) is also intransitive but often used for everyday things like doors, shops, or holes. For emotional opening, 心を開く (こころをひらく) uses ひらく, not あける.
Do not translate 'opening up' emotionally as 開ける (あける). That would mean physically opening something. Use 心を開く or 打ち解ける instead.
I quickly opened up to him / we hit it off.
His research opened up a path to new treatments.