1. Godan verb with 'ku' ending, Intransitive verb

   to well (up); to gush out (of water); to spring out; to surge

   彼女の目には涙が湧きあふれていた。

2. to appear (esp. suddenly) (sweat, tears, etc.); to sweat; to cry

3. to feel emotions (e.g. joy, bravery, etc.); to spring up (e.g. an idea, emotions, clouds); to well up; to arise

4. to hatch; to breed; to propagate; to be infested (esp. of parasitic insects, etc.)

Also written 涌く【わく】waku