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I believe that it must be some word play here, but what does it really mean?
What is 広がる広げる？

Edit: この文は漢字教材で出会いました。特別なコラムみたいなものです。普通の音読みと訓読みなどの学習ではなく、音の濁りや形声文字について紹介しています。
CC BY-SA 4.0
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translation
「広がる広げる漢字の知識」ってどういう意味ですか
Is this the title of a book, article, lecture or such? This phrase is not
really a wordplay. It's just 広がる漢字の知識 ("expanding knowledge of kanji"; 広がる is
intransitive) and 広げる漢字の知識 ("knowledge of kanji _you_ expand"; 広げる is
transitive) said together. Technically, it's an example of [right-node
raising](https://japanese.stackexchange.com/a/17744/5010).
CC BY-SA 4.0
2018-07-18T12:48:16.080
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We use "知識を広げる" when I want to say "understand deeply/well".

at first, the knowledge(知識) is a point.

when you learn deeply, its gonna be spread.

and this time there is two words "広げる and 広がる".

by read/watch this book/movie(I guess its title of a book/movie for learning
something), spread your knowledge by yourself(広げる＝transitive verb), and, your
knowledge is gonna be spread Naturally (intransitive verb).

so, the words 広げる広がる want to say "you can get really good effect by read/watch
it".

we use such expression for advertising slogan only, we seldom use it for daily
talk.
CC BY-SA 4.0
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answer