to well (up) ②to appear (esp. suddenly) (sweat, tears, etc.) ③to feel emotions from (joy, bravery, etc.) ④to hatch (esp. of parasitic insects, etc.)

to gush forth

spring water

to boil up ②to arise ③to get excited

to gush out

to happen suddenly

those who seek riches will find them

to appear suddenly

welling (up) ②appearing (esp. suddenly) ③frothing of water (due to an advancing school of fish)

to breed (e.g. maggots)

to feel that something is true or actually happening

to tingle with excitement

gushing out

spring

output

bubbling spring

hydrothermal discharge zone