Play it by ear and Set up

Play it by ear verb - Decide on one's actions as one goes along, depending on the situation.

Set up and play it by ear are semantically related. In some cases you can use "Set up" instead a verb phrase "Play it by ear".

Set up verb - To arrange something in a certain spot or position.

Play it by ear and set up are semantically related. Sometimes you can use "Play it by ear" instead a verb "Set up".