This is the 17782nd most frequent Russian word.
уменьшилось
"Decreased."
Here, 'уменьшилось' reflects the act of becoming fewer in quantity, specifically referring to the number of visitors.
Количество посетителей музея уменьшилось в выходные.
The number of museum visitors decreased over the weekend.
In this context, 'уменьшились' is used to denote a reduction in size or volume, pertaining to water reservoirs.
После длительной засухи водоемы значительно уменьшились.
After a long drought, the water reservoirs significantly reduced.
Here, 'уменьшились' refers to a decrease in financial expenditures, using it in the context of costs.