How do you use the word Plunge in a sentence?

After twenty minutes in a hot sauna, I jumped into the plunge pool to cool off.

I will go plunge the clogged toilet.

One way a sWord is used is to plunge it into the enemy.

If a car misses the curve, it will plunge off the cliff into the ravine.
The weather was so hot, I decided to take a plunge into the pool.