- 1[intransitive, transitive] to move or make somebody/something move suddenly forwards and/or downwards + adv./prep. She lost her balance and plunged 100 feet to her death. The train left the track and plunged down the embankment. plunge somebody/something + adv./prep. The earthquake plunged entire towns over the edge of the cliffs.
- 2[intransitive] (of prices, temperatures, etc.) to decrease suddenly and quickly synonym plummet Stock markets plunged at the news of the coup. This year profits plunged by 40%.
- 3[intransitive] + adv./prep. (of a road, surface, etc.) to slope down steeply The track plunged down into the valley.
- 4[intransitive] to move up and down suddenly and violently The horse plunged and reared. (figurative) His heart plunged (= because of a strong emotion). Word Origin late Middle English: from Old French plungier
BrE BrE//plʌndʒ//; NAmE NAmE//plʌndʒ//Verb Forms present simple I / you / we / they plunge
BrE BrE//plʌndʒ//; NAmE NAmE//plʌndʒ//he / she / it plunges
BrE BrE//ˈplʌndʒɪz//; NAmE NAmE//ˈplʌndʒɪz//past simple plunged
BrE BrE//plʌndʒd//; NAmE NAmE//plʌndʒd//past participle plunged
BrE BrE//plʌndʒd//; NAmE NAmE//plʌndʒd//-ing form plunging
BrE BrE//ˈplʌndʒɪŋ//; NAmE NAmE//ˈplʌndʒɪŋ//