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The context here is that an elevator fell and someone died in the fall

> ワイヤを止めてる金具が外れて落下という線には間違いないんだけどね

I understand the sentence but i can't wrap my head around 線's meaning here
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2019-10-01T14:23:23.710
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2019-10-01T16:41:09.367
2019-10-01T16:41:09.367
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question
words usage
what does 線 mean here?
This 線 refers to a possible way of thinking, a possible solution (among
others), an approach, etc. This is often used in detective stories.

>   * 物事を行う道筋・方針。「その線で交渉しよう」
> ([デジタル大辞泉](https://dictionary.goo.ne.jp/jn/125520/meaning/m0u/))
>   * 物事を行う上での（漠然とした）方針や道筋。「その線で考えてみよう」(明鏡国語辞典 第二版)
>   * 8. line (of action); position; approach; policy; principle
> ([jisho.org](https://jisho.org/search/%E7%B7%9A))
>
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2019-10-01T14:33:51.553
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answer