Tumbles

verb

1. To fall end over end; to roll over and over.
2. To perform gymnastics such as somersaults, rolls, and handsprings.
3. To drop rapidly.

   "Share prices tumbled after the revelation about the company's impending failure."

4. To smoothe and polish, e.g., gemstones or pebbles, by means of a rotating tumbler.
5. To have sexual intercourse.