Ear paying careful attention; an immature person; making no impression on something or someone; dealing with difficulties as they arise; someone is “all ears”; a Ferengi; an ear splitting sound; keeping “an ear to the ground”; someone “wet behind the ears”; someone soon to be “out on their ear”; “up to your ears” in a situation; someone giving you “an earful”. What is “going in one ear and out the other”?