Noun
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the emergence of a tooth as it breaks through the gum
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a sudden very loud noise
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a sudden violent spontaneous occurrence (usually of some undesirable condition)
"the outbreak of hostilities"
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(of volcanos) pouring out fumes or lava (or a deposit so formed)
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symptom consisting of a breaking out and becoming visible
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the sudden occurrence of a violent discharge of steam and volcanic material
- volcanic eruption