This is the 763rd most frequent Ukrainian word.
сказали
"Сказали" means "said" in English.
In this sentence, 'сказали' indicates reporting speech.
Вони сказали, що зустріч відбудеться завтра.
They said that the meeting will take place tomorrow.
Here, 'сказали' is part of a reported statement acknowledging delivery of expression.
Ти казав, що вони вже сказали свою думку?
Did you say that they have already said their opinion?
In this example, 'сказали' has an implied third-person plural subject, referring to an undefined person or group delivering the statement.