v. t.1.To sink from a swollen state; to subside.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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You see, I had had my boots off, to unswell my feet, and just then I took up one of them to put it on, and I catched a glimpse of the heel-bottom, and it just took my breath away.
Different from Marcellus shale where kaolinite is the main clay swell who has a larger swell potential, the main clay mineral in Longmaxi shale and Green River shale is illite, which is always been regarded as unswell clay.
Wasti and Alyanak [9] studied sand-clay mixtures and observed that when the initial, unswelled, clay content is sufficient to fill the voids within the sand at its maximum porosity, the overall behaviour tends to be similar to clay.