Use 'upswell' when discussing topics that can metaphorically swell like emotions or support, not physical objects. The charity experienced an upswell of donations after the viral campaign.
Pro Tip 2/3
Intensity Increase
'Upswell' indicates a powerful or strong increase that is often unexpected or rapid. After the speech, there was an upswell in civic engagement.
Pro Tip 3/3
Emotionally Charged
Using 'upswell' can often imply an emotional context and resonate with listeners. There was an upswell of pride among the athletes after the victory.