Entry
  1. Adverb (fukushi), Adverb taking the 'to' particle, Suru verb

    simmering; (boiling) gently

    Onomatopoeic or mimetic word

    スープがなべでぐつぐつ煮えている。
    The soup is bubbling in the pot.

Also written グツグツ

Pitch on OJAD