This is the 15832nd most frequent Polish word.
słyszeć
"To hear."
'Słyszę' is the first person singular form of 'słyszeć', used here to denote perceiving sound.
Słyszę muzykę z sąsiedniego pokoju.
I hear music from the neighboring room.
'Słyszałeś' is the second person singular past tense form of 'słyszeć', indicating to have heard of or about something.
Czy słyszałeś o tym nowym filmie?
Have you heard about the new movie?
'Słyszeć' is used in the un-conjugated infinitive form expressing the ability or inability to hear.