to fall suddenly, helplessly, or awkwardly
He tumbled down the stairs
to perform acrobatic moves such as handstands, somersaults, back flips, etc
to roll over and over or to and fro
The puppies tumbled around the garden
to move hurriedly and confusedly
The children tumbled out of school
said of prices, etc: to decline suddenly and sharply
informal (+ to) to realize, understand, or become aware of something suddenly
She eventually tumbled to the fact that he'd been lying to her
to rumple or disarrange (esp hair or clothes)
to cause (somebody or something) to tumble; to push or topple
to throw (things) together in a confused mass
to rumple or disarrange (something, esp hair or clothes)
to dry (laundry) in a tumble-dryer
to polish or clean (gemstones, etc) in a rotating drum
informal to have sexual intercourse with (somebody)
Quoth she, ‘Before you tumbled me, you promised me to wed.’ — Shakespeare