1. a violent bubbling up or surging upward
Usage: rare; literary

Examples

• The upboiling of the hot spring created a dramatic display.
• An upboiling of emotions overwhelmed her during the speech.
• The volcanic upboiling sent steam high into the air.
• The crowd’s upboiling anger was visible from across the square.
• The upboiling of the muddy water made it impossible to see the bottom.