1. how so - Adverb
2. how so - Phrase
Used as an intensifier.
How?; In what way?
The city of Melbourne has much more culture than Sydney. ― How so?
(idiomatic) Why?; For what reason?
I'm feeling really depressed. ― How so?
How; In what way; however
(idiomatic) Why; For what reason.
Source: en.wiktionary.orgAnd I wondered, not for the first time, what patriotism is, what the love of country truly consists of, how that yearning loyalty that had shaken my friend's voice arises, and how so real a love can become, too often, so foolish and vile a bigotry. Where does it go wrong? Ursula K. Le Guin
I have to be very careful, however, because I have no intention of providing an excuse for this behavior. It's an attempt to explain how so many women come from backgrounds where the pressure to be a good mother is so severe that if they can't do it, something really snaps. Caleb Carr
I probably spent the first 20 years of my life wanting to be as American as possible. Through my 20s, and into my 30s, I began to become aware of how so much of my art and architecture has a decidedly Eastern character. Maya Lin
[Footnote:] The Dotterel weighs only four ounces. It has long been a scientific riddle how so much wrong-headedness can manage to exist in so small a space. Still, there's the Least Gnatcatcher. Will Cuppy
Don't you think it's weird how so many awards these days look like rough crystal formations freshly carved from the rock? Oh I guess you wouldn't know because YOU DON'T WIN AWARDS. Ben Croshaw
How strange it is, he thought, how so many senseless things shape our destiny. Clifford D. Simak