verb (used without object), verb (used with object), upswelled, upswelled or upswollen, upswelling.
to swell up.

1350–1400; Middle English; see up-, swell Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
upswell (ʌpˈswɛl)
vb , -swells, -swelling, -swelled, -swelled, -swollen
rare to swell up or cause to swell up

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Boosting supplies of oil and metals to meet this structural upswell in demand is not easy.
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