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Phrase(s): plunge to something
1. to fall or drop down to something. • The temperature plunged to zero last night. • The burning car plunged to the floor of the canyon. 2. to dive or fall to one’s death. • She walked straight to the edge of the cliff and plunged to her death. • The burro slipped and plunged to an untimely end.
McGrawhill's American Idioms And Phrasal Verbs