This is the 4727th most frequent Russian word.
забыли
"Forgot" (past tense of "forget").
This usage of the word "забыли" (forgot) is in the past tense, addressing someone formally (or addressing multiple people) to indicate that they accidentally left their coat behind.
Вы забыли ваше пальто дома.
You forgot your coat at home.
Here, "забыли" (forgot) is used in the past tense to express that the speaker and others collectively failed to remember a scheduled event.
Мы совсем забыли про встречу.
We completely forgot about the meeting.
In this example, "забыли" (forgot) is part of a conditional sentence, referring to a hypothetical situation where someone might forget a password.