How to use "plunged" in a sentence

With that attitude plus a few money-management skills, they were able to hang on longer than most slot players who plunged at the dollar machines after getting nowhere with quarters, and because of their patience and perseverance, the duchesses won more jackpots than did the tide of tourists that ebbed and flowed around them

The temperature plunged rapidly, and the beads of water froze

At last, she just plunged into it: "What I'm thinking..

In the foyer, Elliot jerked open the front door, pushed her through ahead of him, and they both plunged into the golden late-afternoon sunshine.