ichidan verb
gush out; spurt forth; effuse
Describes liquid, light, or emotion bursting out forcefully and suddenly. Often used for water, blood, tears, or strong feelings.
パイプから水がほとばしり出た。
Water gushed out from the pipe.
彼の目から涙がほとばしり出た。
Tears spurted from his eyes.
Common kana-kanji mixed spelling; the kanji 出る is standard for 'to come out'.
Rare kanji spelling using 迸; not commonly used in modern writing.
噴き出す also means to gush or spout, but is more commonly used for liquids or smoke erupting from a confined space, while ほとばしり出る emphasizes a sudden, forceful bursting forth, often with emotional intensity.
湧き出る means to well up or spring forth, typically for water from a natural source, and lacks the violent, spurting nuance of ほとばしり出る.
Compound of ほとばしり (continuative form of ほとばしる, 'to spurt') + 出る (でる, 'to come out'). The exact origin of ほとばしる is uncertain, but it is likely a mimetic or sound-symbolic word related to the sound of liquid spurting.