1996, Chris Butlin, Maureen Maybank, Physics on the move (page 31)Seatbelts, airbags, collapsible steering columns, dentable windscreens, squashable fascias and squashable front and rear ends have all added to safety, but how? To answer that you will need to recall some GCSE physics and learn more formal ways of expressing it — using equations and graphs.
(mathematics)
2006, American Institute of Mathematical Sciences, Discrete and continuous dynamical systems: Volume 16All other ergodic invariant Radon measures are squashable, and there are infinitely many such measures...
