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WordNet-Online 
 Definitions from WordNet
Verb burst in on has 1 sense 
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| Definitions from the WebBurst In OnVerb phrase: To enter a place suddenly and unexpectedly, typically interrupting someone or something. Senses:
 Examples:
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| bursera simaruba burseraceae bursiform bursitis bursque bursqueness burst burst forth burst in on burst of burst out burst upon bursted burster bursting bursting at the seams bursting charge 
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