Verb
To fall off something, or down something.
Prince Charles spent the night in the hospital after he took a tumble off his horse yesterday while playing polo and briefly lost consciousness.
(idiomatic) To fall in price or value.
Acme Industries shares took a tumble yesterday to the lowest value since 2001.
Skateboarding teaches you how to take a fall properly. If you try to kickflip down some stairs, it might take you thirty tries - and you just learn how to take a tumble out of it without getting hurt. Bam Margera