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> ウェストコットの言うことは純然たる事実であった。個の力で勝るはずのエレンが目標を仕留め損なっているのは、毎回精霊たちが **妨害に入っ**
> てくるからに他ならない。(Date a live, novel)

I have looked up the word 入る in many dictionaries but can’t find a relevant
definition for 妨害に入る in this context. So what does 〜に入る mean here? Or how
should I understand it generally (when it is used in an abstract sense)?
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2021-03-28T07:28:49.130
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words
Understanding 〜に入る
> So what does 〜に入る mean here?

〜に入る here is just a modification for 妨害, so it is basically equivalent to
妨害してくる.

> Or how should I understand it generally

You can think of X に入る as "come and do X" or "start to do X".

Here are examples that I came up with:

  * 仲裁に入る
  * 成層圏に入る
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2021-03-28T12:24:28.407
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It helps to understand that this に in 妨害に[入る]{はいる} is

> **に**  
>  (Ⅲ)動作・作用の結果、状態や目的などを表す。  
>  ...  
>  ㋗《下に移動を表す動詞を伴い、動詞連用形や動作性名詞に付いて》移動の目的を表す。  
>  「映画を見 **に** 行く」  
>  「家まで忘れ物を取り **に** 帰る」  
>  「町に買い物 **に** 出る」

(source: 明鏡国語辞典)

In other words it indicates the purpose of a movement verb like [入る]{はいる}, 行く,
帰る, etc. So 妨害に[入る]{はいる} means to enter/step in/approach in order to
interfere/get in the way.

A few other examples:

> 見舞いに行く  
>  To go in order to visit someone [who is sick]
>
> 学生が質問に来る  
>  A student comes in order [to ask] a question
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