Idiom of the day :- Play It by Ear

Usage, examples and definition of the Idiom :-

Let’s go to the movies, agreed? Sure. And what’ll we do after that ? Oh, I don’t know. Let’s play it by ear. Well, I would like to have a more definite plan of action. Don’t be like that. It’s always more fun not knowing what to expect and deciding what to do as we go along.