- no obj., with adverbial jump or dive quickly and energetically（很快地有力地）跳入, 扎进, 投入：
our little daughters whooped as they plunged into the sea.
我们的小女儿们欢呼着跳进了大海。
- fall suddenly and uncontrollably（突然失控地）一头坠入：
a car swerved to avoid a bus and plunged into a ravine.
一辆小车急转方向以避开一辆公共汽车, 因而一头坠入了峡谷之中。
- as adj. plunging denoting a very low-cut neckline on a woman's garment（女式服装）领口低的。
- embark impetuously on a speech or course of action（鲁莽地）开始, 着手（说话或行动）：
he came to a decision, and plunged on before he had time to reconsider it.
他做出了决定, 并且不假思索就急忙付诸行动了。
- suffer a rapid decrease in value（价值）猛跌：
shares in the company plunged 18p on news that profits had fallen.
利润下降的消息传来, 公司的股票便骤然猛跌了18便士。
- (of a ship) pitch（轮船）颠簸：
the ship plunged through the 20-foot seas.
轮船在20英尺深的大海中颠簸。
- no obj.(of a horse) rear violently（马）猛地用后腿直立。
- with obj. and adverbial push or thrust quickly猛推, 猛插：
he plunged his hands into his pockets.
他猛地把手插入了口袋。
- put (something) in liquid so as to immerse it completely投入（液体中以使淹没）：
to peel fruit, cover with boiling water and then plunge them into iced water.
要将水果削皮, 先用沸水浸泡, 随后将之投入冰水。
- （常作be plunged into）suddenly bring into a specified condition or state骤然陷入：
for a moment the scene was illuminated, then it was plunged back into darkness.
场景被照亮了一下, 随后就又陷入了黑暗之中。
- with obj. sink (a plant or a pot containing a plant) in the ground栽进, 种下（植物）。
- an act of jumping or diving into water跳入, 扎入（水中）：
fanatics went straight from the hot room to take a cold plunge.
痴迷者径直从很热的房间出来跳到很冷的水里。
- a swift and drastic fall in value or amount（价值或数量的）骤然下跌：
the central bank declared a 76% plunge in its profits.
中央银行声称其利润骤减了76%。
take the plunge
- informal commit oneself to a course of action about which one is nervous〈非正式〉冒险尝试。