Wiktionary
take a tumble
vb. 1 To fall off something, or down something. 2 (context idiomatic English) To fall in price or value.
Usage examples of "take a tumble".
I might take a tumble in your esteem, but I got to confess it fair drives me crazy to watch you pick at your food.
Just so long as the stiller didn't set a foot in a rodent hole and take a tumble!