1. start abruptly; "After 1989, peace broke out in the former East Bloc"
(synonym) break out
(hypernym) begin, start
2. erupt or intensify suddenly; "Unrest erupted in the country"; "Tempers flared at the meeting"; "The crowd irrupted into a burst of patriotism"
(synonym) irrupt, flare up, flare, break open, burst out
(hypernym) intensify, deepen
(derivation) outbreak, eruption, irruption
3. start to burn or burst into flames; "Marsh gases ignited suddenly"; "The oily rags combusted spontaneously"
(synonym) ignite, catch fire, take fire, combust, conflagrate
(hypernym) change state, turn
(hyponym) blow out
(verb-group) burn, combust
4. as of teeth, for example; "The tooth erupted and had to be extracted"
(synonym) come out, break through, push through
5. become active and spew forth lava and rocks; "Vesuvius erupts once in a while"
(synonym) belch, extravasate
(hypernym) explode, burst
(derivation) eruption, eructation, extravasation
6. force out or release suddenly and often violently something pent up; "break into tears"; "erupt in anger"
(synonym) break, burst
(hypernym) express emotion, express feelings
7. appear on the skin; "A rash erupted on her arms after she had touched the exotic plant"
(verb-group) come out, break through, push through
8. become raw or open; "He broke out in hives"; "My skin breaks out when I eat strawberries"; "Such boils tend to recrudesce"
(synonym) recrudesce, break out
(hypernym) afflict, trouble, ail, pain