How to Say “Bosom Buddy” in Japanese

腹心の友
fukushin no tomo
The English phrase "bosom buddy" is translated into Japanese as 腹心の友 (fukushin no tomo).
This phrase refers to a very close and trusted friend with whom one shares their deepest secrets.

Is there a formal and an informal way to say it?

腹心の友 is a somewhat literary and formal way to describe a very close friend.

How do you pronounce it?

fukushin no tomo

Did you know?

  • Japanese culture has a concept called 腹を割る 'splitting the belly' which means to speak honestly and openly. This is the physical metaphor for the trust required to have a 腹心の友.
  • In Japanese culture, the 'center' of a person's true intentions and feelings is often thought to reside in the gut rather than the head.
  • While 腹心の友 is literary, the modern slang ズッ友 'zuttomo' is used by youth to mean 'friends forever'. It is a contraction of ずっと 'always' and 友達 'friend'.

Examples in context

  • 彼女は私の親友です。
    She is my bosom buddy.
  • 私たちは昔から親友です。
    We have been bosom buddies since childhood.
  • 彼は私の腹心の友です。
    Kare wa watashi no fukushin no tomo desu.
    He is my bosom buddy.

Example conversation

Daishō and Yui are talking about their childhood best friend.

  1. 大翔 Hiroto

    彼とはもう十年以上の付き合いなんだ。
    Kare to wa mō jūnen ijō no tsukiai nanda.
    I've known him for over ten years now.
  2. 結衣 Yui

    そんなに長い付き合いなら、信頼しているんだね。
    Sonna ni nagai tsukiai nara, shinrai shite iru n da ne.
    If you've known him that long, you must trust him.
  3. 大翔 Hiroto

    ああ、彼は私の腹心の友だからね。
    Aa, kare wa watashi no fukushin no tomo dakara ne.
    Yeah, because he is my bosom buddy.
  4. 結衣 Yui

    素敵な関係ね。私もそんな友達が欲しいわ。
    Sutekina kankei ne. Watashi mo sonna tomodachi ga hoshii wa.
    That's a wonderful relationship. I want a friend like that too.
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Monique Mildred
Monique MildredHelp make this guide better. Spot a mistake, know another way to say it, or have an example from real life? Share it below.
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