erupt
verb
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become active and spew forth lava and rocks“Vesuvius erupts once in a while”belch
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erupt or intensify suddenly“Unrest erupted in the country”flare
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become raw or openrecrudescebreak out
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start abruptlybreak out
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appear on the skin“A rash erupted on my arms after I touched the exotic plant.”
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break out“The tooth erupted and had to be extracted”come outbreak throughpush through
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force out or release suddenly and often violently something pent upbreak
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start to burn or burst into flamescombustignitecatch firetake fireconflagrate