/plʌndʒ ||; plʌndʒ/verb1 [I] plunge (into sth/in) to jump, drop or fall suddenly and with force 突然猛力跳进、掉落或跌进: He ran to the river and plunged in. 他跑到河边，纵身跳进河里。 (figurative 比喻) Share prices plunged overnight. 股票价格一夜之间暴跌。
2 [T] plunge sth in/into sth to push sth suddenly and with force into sth （突然用力把某物）插入，刺进: He plunged the knife into the table in anger. 他一怒之下把刀插入桌子。
3 [T] to cause sb/sth to suddenly be in the state mentioned 使突然陷入（某种状态）: The country has been plunged into chaos by the floods. 全国因洪水而陷入混乱之中。
4 [I] plunge into (doing) sth to start doing sth with energy and enthusiasm （劲头十足而热情洋溢地）投入（某工作）: Think carefully before you plunge into buying a house. 买房子之前要三思，不要操之过急。