welling

present participle and gerund of wellform-ofgerundparticiple

The act of something that wells, or issues forth like water.

• It spread slowly up from the sea-rim, a welling upwards of pure white light, ghosting the beach with silver and drawing the grey bastions of sandstone out of formless space.
• Later experience suggested that such wellings up of molten glass from caverns filled with active lava in a period of outflow might be due to sudden generation of steam from cascades of water during torrential rainfall.