1. a sudden steep fall or drop

1. to jump or dive quickly and forcefully into water or downward
2. to fall or drop suddenly and steeply
3. to thrust or push something forcefully into something else

Examples

• The swimmer plunges into the pool from the high diving board.
• Stock prices plunged after the company announced losses.
• She plunges the knife into the watermelon to cut it.
• He plunges into his work with renewed determination.
• The road takes a steep plunge down the mountainside.
• The temperature plunges below freezing in winter.
• The cliff plunges dramatically into the ocean below.
• After the scandal, his popularity took a sudden plunge.