From Longman Dictionary of Contemporary Englishlisten out phrasal verb British English informalLISTENto listen carefully so that you will notice a particular sound for Listen out for the baby in case she wakes up. → listen→ See Verb table
Examples from the Corpus
listen for• I was really afraid I'd not get it all down, and all the time he was listening out for me.• Even if Kirov was still listening out for radio contact, he was unlikely still to be in direct touch with the pilot.• When you read a work of history, always listen out for the buzzing.• He no longer had to consciously listen out for the psychic interference that pervaded the island. 