how so

Phrase

idiomatic

How?; In what way? / (idiomatic) Why?; For what reason?

Japanese Meaning

どのような方法でそうなるのか？ / どんな理由があってそうなのか？

When she heard the claim, she asked how so, wanting more details.

その主張を聞いて、彼女は「それはどういうことですか」ともっと詳しく知りたがった。

Sense（1）

How?; In what way?

The city of Melbourne has much more culture than Sydney. ― How so?

Sense（2）

(idiomatic) Why?; For what reason?

I'm feeling really depressed. ― How so?