1
to well (up);to gush out (of water);to spring out;to surge
2
to appear (esp. suddenly) (sweat, tears, etc.);to sweat;to cry
彼女の目には涙が湧きあふれていた。
Her eyes gushed with tears.
3
to feel emotions (e.g. joy, bravery, etc.);to spring up (e.g. an idea, emotions, clouds);to well up;to arise
いざとなれば勇気が湧いてくる。
Your courage will come out in a crisis.
4
to hatch;to breed;to propagate;to be infested (esp. of parasitic insects, etc.)
肉にはウジがわいていた。
The meat was crawling with maggots.
Other forms
涌く 【わく】 (rarely used kanji form)