Crash Together Meaning

Example: Used other than as an idiom: see crash,‎ together.
  He was driving and I was in the passenger seat, so we crashed together when the truck hit us.
To bang objects together with enough force to generate a loud noise.
  She crashed those blocks together to keep rhythm for the band.
To cause objects to collide with great force.
  We've been crashing these cars together to see how they survive accidents.