So in a sentence

After he got on crutches he used to take the temperature so Ag would not have to get up from the bed.
Ernest Hemingway, In Our Time

He didn’t listen to me, he was listening so hard for the music to start.
Ernest Hemingway, In Our Time

So I went down and caught up with them and grabbed him while he was crouched down waiting for the music to break loose and said, Come on Luis.
Ernest Hemingway, In Our Time

The thick-iron ferrule is worn down, so it is evident that he has done a great amount of walking with it.
Arthur Conan Doyle, The Hound of Baskervilles

Because this stick, though originally a very handsome one has been so knocked about that I can hardly imagine a town practitioner carrying it.
Arthur Conan Doyle, The Hound of Baskervilles

Finally the bull was too tired from so much bad sticking and folded his knees and lay down and one of the cuadrilla leaned out over his neck and killed him with the puntillo.
Ernest Hemingway, In Our Time

“Why, my dear, you must know, Mrs. Long says that Netherfield is taken by a young man of large fortune from the north of England; that he came down on Monday in a chaise and four to see the place, and was so much delighted with it, that he agreed with Mr. Morris immediately; that he is to take possession before Michaelmas, and some of his servants are to be in the house by the end of next week.”
Jane Austen, Pride and Prejudice

He had so much equipment on and looked awfully surprised and fell down into the garden.
Ernest Hemingway, In Our Time

Oh, I am so soused.
Ernest Hemingway, In Our Time

He went under the anæsthetic holding tight on to himself so that he would not blab about anything during the silly, talky time.
Ernest Hemingway, In Our Time

They felt as though they were married, but they wanted everyone to knew about it, and to make it so they could not lose it.
Ernest Hemingway, In Our Time

After the armistice they agreed he should go home to get a job so they might be married.
Ernest Hemingway, In Our Time

The kid came out and had to kill five bulls because you can’t have more than three matadors, and the last bull he was so tired he couldn’t get the sword in.
Ernest Hemingway, In Our Time

“My dear Mr. Bennet,” replied his wife, “how can you be so tiresome!
Jane Austen, Pride and Prejudice

Since we have been so unfortunate as to miss him and have no notion of his errand, this accidental souvenir becomes of importance.
Arthur Conan Doyle, The Hound of Baskervilles

However little known the feelings or views of such a man may be on his first entering a neighbourhood, this truth is so well fixed in the minds of the surrounding families, that he is considered the rightful property of some one or other of their daughters.
Jane Austen, Pride and Prejudice

“Design! Nonsense, how can you talk so!
Jane Austen, Pride and Prejudice

How so?
Jane Austen, Pride and Prejudice

Why so?
Arthur Conan Doyle, The Hound of Baskervilles


Dictionary

Merriam-Webster
— in a manner or way indicated or suggested
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Macmillan
— used for emphasis
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Usage

10 uses of ‘so’ in In Our Time, by Ernest Hemingway
592 uses of ‘so’ in Pride and Prejudice, by Jane Austen
139 uses of ‘so’ in The Great Gatsby, by F. Scott Fitzgerald
244 uses of ‘so’ in The Hound of the Baskervilles, by Arthur Conan Doyle