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upswell

[uhp-swel]
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verb (used with or without object), up·swelled, up·swelled or up·swol·len, up·swell·ing.
  1. to swell up.
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Origin of upswell

Middle English word dating back to 1350–1400; see origin at up-, swell
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for upswell

upswell

verb -swells, -swelling, -swelled, -swelled or -swollen
  1. rare to swell up or cause to swell up
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012