This is the 3584th most frequent Russian word.
слышали
"Heard."
Here, 'слышали' is in the past tense, plural form, indicating that the subject didn't perceive the sound.
Они не слышали, что я сказал.
They didn't hear what I said.
In this case, 'слышали' describes the action of perceiving sounds that occurred in the past for a group including the speaker.
Мы слышали музыку издалека.
We heard music from afar.
The word 'слышали' is used in the past tense, plural or polite form to ask if someone heard something in the past.