verb (used with or without object), up·swelled, up·swelled or up·swol·len, up·swell·ing.
- to swell up.
verb -swells, -swelling, -swelled, -swelled or -swollen
- rare to swell up or cause to swell up
verb (used with or without object), up·swelled, up·swelled or up·swol·len, up·swell·ing.
verb -swells, -swelling, -swelled, -swelled or -swollen