词典释义：
[no obj., with adverbial]jump or dive quickly and energetically
（很快地有力地）跳入，扎进，投入
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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
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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.
（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）
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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
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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
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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
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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）
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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
骤然陷入
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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）
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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
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the central bank declared a 76% plunge in its profits .中央银行声称其利润骤减了７６％。
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take the plunge informal commit oneself to a course of action about which one is nervous〈非正式〉 冒险尝试
"late Middle English： from Old French
