so's en · X · etymology 1
Etymology
Contraction of so as.
Meanings
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(contraction) So that, in order that.
Of all the queer collections of humans outside of a crazy asylum, it seemed to me this sanitarium was the cup winner. […] When you're well enough off so's you don't have to fret about anything but your heft or your diseases you begin to get queer, I suppose.
1913, Joseph C[rosby] Lincoln, chapter V, in Mr. Pratt’s Patients, New York, N.Y.; London: D[aniel] Appleton and Company, →OCLC:
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(contraction) To the extent that.
"Has he been working?" / "Not so's you'd notice."