plunge in/plunge intosth
—phrasal verbwithplungeverbuk/plʌndʒ/us/plʌndʒ/
C2
tosuddenlystartdoing somethingactivelyor enthusiastically
突然开始积极地做
Twomonthsbefore hisexams, hesuddenlyplungedinto hisstudies.考试前的两个月，他突然开始埋头学习。
He took adeepbreathandplungedinto hisspeech.他深吸了一口气，开始热情洋溢地讲了起来。