suru verb (special), intransitive verb
double; become twice as much
Intransitive use: the subject itself becomes twice the original amount or size. Often used with numbers, amounts, or abstract qualities.
売り上げが去年の倍に倍した。
Sales doubled compared to last year.
suru verb (special), intransitive verb
Intransitive use for a general increase, not necessarily exactly doubling. Less common than sense 1; often replaced by 増える or 増加する in modern Japanese.
人口が倍する一方で、資源は限られている。
While the population increases, resources are limited.