verb
- to boil up; to bubble up or surge upward
Usage: archaic; rare
Examples
- The hot spring began to upboil with renewed vigor.
- Steam and water upboiled from the geyser’s opening.
- The cauldron’s contents upboiled violently over the fire.
- Emotions seemed to upboil within him as he spoke.
- The troubled waters upboiled around the rocky shore.