JLPT N1Four-character idioms

付和雷同

Meaning
自分の意見を持たず軽々しく他人の意見に同調すること
Explanation
「付和雷同」 means to go along thoughtlessly with others' opinions without having one's own firm view, just as things resonate in response to thunder. It is a word that critically expresses a lack of independence. c1, meaning to assert one's own original views, is the exact opposite. c2 and c3, which literally connect 「雷同」 with thunder, are misreadings; the point lies entirely in easy conformity.
Original Japanese explanation

「付和雷同」は、自分にしっかりした考えがなく、雷に応じて物が鳴るように、軽々しく他人の意見に同調することをいう。主体性のなさを批判的に表す語。c1 は逆に独自の主張をする意で正反対。「雷同」を字面どおり雷と結びつける c2・c3 は誤読で、要点はあくまで安易な同調にある。

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