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In what way? Why? This phrase is usually used to invite further explanation or discussion. A: "I thought his artwork was just fascinating." B: "Really? How so?"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Please explain your remark. A: You have to bring all the lawn furniture in. B: How so?
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
see under how come?
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
How is it so: You say the answer is wrong. How so?
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.