Denshi Jisho — Online Japanese dictionary

湧く わく 1: to well (up); to gush forth (of water); to spring out; to surge;
2: to appear (esp. suddenly) (sweat, tears, etc.);
3: to feel emotions form (joy, bravery, etc.);
4: to hatch (esp. of parasitic insects, etc.)
Common word, Godan verb with ku ending, Intransitive verb 

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