to listen to give attention to someone or something in order to hear them
[Cambridge Advanced Learner's Dictionary]
phrasal verbs
listen in on sth - if you listen in on a conversation, you listen to it, especially secretly, without saying anything
I wish Dad would stop listening in on my phone conversation. Życzę sobie, aby mój tata przestał słuchać moich rozmów telefonicznych.
listen out for sth - to make an effort to hear a noise that you are expecting
Would you listen out for the phone while I'm in the garden? Możesz nasłuchiwać telefonu kiedy ja będę w ogrodzie?
listen up - INFORMAL - something you saying you say to make people listen to you
Okay everyone - listen up! I have an announcement to make. Ok wszyscy - słuchajcie! Mam wiadomość.