This is the 10565th most frequent Russian word.
вливались
"Вливались" means "were pouring into" or "were integrating into."
Here, 'вливались' figuratively indicates the act of integrating into a social or professional group.
Они вливались в эту группу, словно всегда были её частью.
They blended into this group as if they had always been a part of it.
In this sentence, 'вливались' refers to the physical act of mixing or integrating different colors together.
Цветные краски вливались в общую картину, создавая красивый узор.
Colorful paints merged into the overall picture, creating a beautiful pattern.
Used here, 'вливались' describes the process of two rivers merging their waters at a meeting point.