Grammar Info

N3 Lesson 9: 23/23

同士(どうし)Fellow, With each other, Mutually, Between, Among, Together, With

Structure

Noun + 同士(どうし)
Noun + 同士(どうし) + の + Noun

Details

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About 同士

同士(どうし) 'fellow' is a noun that may be used in the same way as a suffix. When used this way, it conveys things that are 'mutually (A)', 'fellow (A)', or '(A) together'.

To use 同士(どうし), attach it directly to the end of another noun, before expressing further information about that 'mutual' relationship. Alternatively, (noun + 同士(どうし) + の + noun) is also common, and expresses that noun (B) is a grouped form of noun (A).

同士(どうし) is used most often to express two different types of 'mutuality'. These are as follows:

種類(しゅるい) - Type. (A) is the same type as (B).

関係(かんけい) - Relationship. (A) shares the same relationship as (B).

Caution

同士(どうし) is most frequently used to highlight 'people', or 'living things' that share some type of relationship, rather than inanimate objects. An easy way to remember this is that the 士(し) kanji in this word means 'gentleman'. However, it may occasionally be seen in reference to inanimate objects as well.

  • この糊(のり)は紙(かみ)同士(どうし)だとよくくっつきますがプラスチック同士(どうし)だとあまりくっつかないです。
    This glue sticks really well between paper, but between plastic, it does not stick well. (Natural, but not very common)
  • プロの格闘家(かくとうか)同士(どうし)の戦(たたか)いは見(み)ていて楽(たの)しい。
    Watching a fight between two professional martial artists is fun. (Natural)

Examples

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    このように紐(ひも)でページ同士(どうし)を結(むす)びつけることができます。

    You can connect pages together with a string like this.

    負(ま)けた者(もの)同士(どうし)で飲(の)みに行(い)こうよ！

    Those among us who have lost, let's go drinking!

    中学生(ちゅうがくせい)同士(どうし)は結婚(けっこん)するには若(わか)すぎる。

    Middle schoolers are too young to marry (each other).

    「だって」は家族(がぞく)や友達(ともだち)同士(どうし)などで使(つか)う、くだけた表現(ひょうげん)なので、上司(じょうし)などとの話(はな)し合(あ)いのときは使(つか)わないでください。

    “だって” is an informal expression used among family and friends, therefore please do not use it when discussing with superiors and the like.

      同級生(どうきゅうせい)同士(どうし)だから、助(たす)け合(あ)わなきゃね。

      We are classmates, so we have to help one another, right?

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