This is the 6329th most frequent Russian word.
ушли
"Ушли" means "went away" or "left" in English.
Here 'ушли' signifies the action of departing from a location.
Они ушли из дома в шесть утра.
They left the house at six in the morning.
In this sentence, 'ушли' figuratively indicates the transition into retirement.
После многих лет работы, они наконец ушли на заслуженный отдых.
After many years of work, they finally retired.
Here 'ушли' is used to convey that the guests had departed prior to the arrival of others.