population_shift has definitions from the field of biology
1
[ noun ] (biology) a change in the relative numbers of the different groups of individuals making up a population

Used in print

(Edward E. Kelly, S.J., "Christian Unity in England"...)

While it must be said that these same Protestants have built some new churches during this period , and that religious population_shifts have emptied churches , a principal reason for this phenomenon of redundancy is that fewer Protestants are going_to church .

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