the GNU version of the Collaborative International Dictionary of English
a. & vb. n. from tumble, v.
The Century Dictionary and Cyclopedia
n. The act of falling; also, the act of turning somersaults, and the like; specifically, the action of the tumbler pigeon in flight.
Falling; fleeting; passing; transitory.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the gymnastic moves of an acrobat
Word Usage
"These elements come together because writer-director Christopher Nolan, who did the last two "Batman" films, is a master at creating what he calls a tumbling forward quality, where you're being pulled into the action."