This is the 1852nd most frequent Russian word.
оставили
"Left" or "abandoned."
In this sentence, "оставили" (left) is used to indicate the action of leaving an object behind in a particular location.
Мы оставили книгу на столе.
We left the book on the table.
Here, "оставили" (left) conveys the idea of creating or leaving an emotional or psychological impact due to an event.
Они оставили неизгладимое впечатление после своей речи.
They left an indelible impression after their speech.
"Оставили" (left) in this context describes the deliberate act of placing and not taking away something during a certain situation.