Definitions for "BIG CRUNCH"
the theory that all matter will again collapse to form the dense material.
The singularity at the end of the universe.
Essentially the opposite of the Big Bang, the Big Crunch is one possible fate of the Universe. If the matter and energy of the Universe are not moving outward quickly enough, gravity could pull the Universe in on itself, collapsing it in a final Big Crunch. It is not yet known whether this will happen to our Universe.