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

1350–1400; Middle English; see up-, swell

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World English Dictionary
upswell (ʌpˈswɛl)
vb , -swells, -swelling, -swelled, -swelled, -swollen
rare to swell up or cause to swell up

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