This is the 13354th most frequent Russian word.
наберут
"Will recruit," "will gather," or "will collect."
In this sentence, 'наберут' is used in the sense of 'collect' or 'gather,' referring to gathering water.
Если наберут воду в ведра, мы сможем полить сад.
If they collect water into buckets, we will be able to water the garden.
Here, 'наберут' means 'gain' or 'score,' referring to the points students accumulate.
На экзамене студенты наберут достаточно баллов, чтобы поступить в университет.
In the exam, students will score enough points to get into university.
In this context, 'наберут' means 'hire' or 'recruit,' referring to employment or engagement for work.