'demographic-decreasing' originates from the combination of 'demographic,' which comes from the Greek word 'dēmos' meaning 'people,' and 'decreasing,' from the Latin 'decrescere,' meaning 'to grow less.'

'Demographic' evolved from the Greek 'dēmos' and 'graphia,' while 'decreasing' transformed from the Latin 'decrescere' to the modern English 'decrease.'

Initially, 'demographic' referred to the study of populations, while 'decreasing' meant 'to grow less.' Combined, they now refer to a reduction in population numbers.