1. having a very low neckline that extends far down
2. dropping or falling steeply

1. present participle of plunge; diving or falling rapidly downward

Examples

• The bird was plunging toward the water to catch fish.
• Stock prices are plunging after the announcement.
• She wore a dress with a plunging neckline to the party.
• The road has a plunging descent into the valley.
• He’s plunging into his new job with enthusiasm.
• The waterfall creates a plunging cascade down the cliff.
• Temperatures are plunging below freezing tonight.