upswim

Verb

upswim (third-person singular simple present upswims, present participle upswimming, simple past upswam, past participle upswum)

1. (ambitransitive, poetic) To swim up or upward.
   • It was at the very date to which we have come, / In the month of the matching name, / When, at a like minute, the sun had upswum, / Its couch-time at night being the same.1917, Thomas Hardy, An Anniversary