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irrevocable
irrevocable trust
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irritable bowel syndrome
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irrupt

ir·rupt [ i rúpt ] (past and past participle ir·rupt·ed, present participle ir·rupt·ing, 3rd person present singular ir·rupts)


intransitive verb 
Definition:
 
1. enter abruptly: to enter suddenly or violently

2. increase quickly: to increase suddenly and rapidly, e.g. in number

[Mid-19th century. < Latin irrupt-, past participle of irrumpere "break into a place" < rumpere "to break"]
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