Useful english dictionary. 2012.
upswell — /up swel /, v.i., v.t., upswelled, upswelled or upswollen, upswelling. to swell up. [1350 1400; ME; see UP , SWELL] * * * … Universalium
upswell — [up swel′] vi. upswelled, upswelled or upswollen, upswelling to swell up … English World dictionary