Plummet (verb)

1. To fall or drop suddenly and steeply.
2. To descend rapidly and steeply.
3. To drop quickly and steeply, as if diving.
4. To fall rapidly and steeply, as if in a straight line.
5. To drop or fall steeply, especially from a height.

Origin:

Late 16th century: from middle french plunet, from plonge "to dive", based on latin plumbum "lead" (a plummet being a weight used in plumbing).

Examples:

1. The stock market plummeted after the news of the scandal broke.
2. The plane plummeted from the sky, crashing into the ground.
3. The temperature plummeted to below zero as the cold front moved in.
4. The value of the currency plummeted, making imports unaffordable for many people.
5. The bird plummeted from the sky, apparently hit by a predator.