big crunch

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big crunch

The time reversal of the Big Bang in which space–time collapses to a singularity. As the big crunch approaches galaxies would start to merge and the temperature associated with the background radiation would increase. The big crunch will occur at the end of time if there is enough mass in the Universe to make it closed. It is currently thought that this is not the case.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

big crunch

[¦big ¦krənch]
(astronomy)
A singularity at the origin of a black hole into which all the matter and radiation in a closed universe would eventually collapse. Also known as gnab gib.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.