eruption

noun

the emergence of a tooth as it breaks through the gum
歯茎から歯が現れること
a sudden very loud noise
突然の非常に大きな雑音
a sudden violent spontaneous occurrence (usually of some undesirable condition)
突然の激しい自然発生（通常いくつかの好ましくない状態の）
- the outbreak of hostilities
  戦闘の勃発
the sudden occurrence of a violent discharge of steam and volcanic material
突然蒸気と火山性の物体が激しく噴出する現象
(of volcanos) pouring out fumes or lava (or a deposit so formed)
（火山について）噴煙または溶岩（または、形成された堆積物）を押し出す
symptom consisting of a breaking out and becoming visible
破裂し見えるようになるものでなる症状

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