This is the 14543rd most frequent Russian word.
пасли
"Пасли" means "grazed" or "herded" (past tense, plural).
In this sentence, 'пасли' is used as the past tense plural verb meaning 'grazed', as in taking care of and leading animals in grazing.
Пастухи пасли овец на лугу.
The shepherds were grazing the sheep in the meadow.
Here, 'пасли' indicates an action of herding or watching over livestock in the past tense for a plural subject.
Мы пасли коров у реки.
We were grazing the cows near the river.
In this example, 'пасли' actively describes the activity of tending to geese in a rural setting in the past.