plunge(sb/sth)intosth
—phrasal verbwithplungeverbuk/plʌndʒ/us/plʌndʒ/
tosuddenlyexperienceabadsituationorunhappiness, or to make someone or somethingsuddenlyexperienceabadsituationorunhappiness
（使）陷入；（使）经历
Thecountrywasplungedintorecession.该国突然陷入经济衰退。
He wasplungedintodespairwhen hiswifelefthim.他妻子离开他时，他一下子陷入绝望之中。