Big crunch

астрономия "большое сжатие" (конечная стадия цикла пульсации Вселенной)

Англо-русский научно-технический словарь

Big crunch

noun Usage: often capitalized B&C a hypothetical cosmological event in which all matter in the universe collapses to a singularity and which is posited to be a possible fate of the universe if the density of matter in it is sufficiently high — compare big bang

Merriam-Webster's Collegiate Dictionary