1. 激剧繁增; 激剧繁殖：irritant 刺激剂; 刺激物; 刺激性的 | irruption 激剧繁增; 激剧繁殖 | ISCCP 国际卫星云气候学计划

2. 侵入,急速增加：ir- (用在r之前)向內、入 | irruption 侵入,急速增加 | irrigate 灌溉

3. 急激增加：irruption 冲进 | irruption 急激增加 | irruptive 突入的

noun

1. a sudden violent entrance
    a bursting in

    e.g. the recent irruption of bad manners

2. a sudden violent spontaneous occurrence (usually of some undesirable condition)

    e.g. the outbreak of hostilities

    Synonym: outbreakeruption

3. a sudden sharp increase in the relative numbers of a population