PLUNGE Meaning of PLUNGE in English I . v. a. Immerse, submerge, dip, souse, douse, put under water ( or other liquid ). II . v. n. Dive, pitch, thrust one's self, cast one's self. III . n. Dive, dip, ducking. Soule. Dictionary of English synonyms. Словарь английских синонимов. 2012