Something that is squeaky is any object or animal that makes a short, high-pitched, sharp sound when moved, pressed, or vocalizing. Common examples include a rusty door hinge that squeaks when you open the door, old floorboards that squeak when you walk on them, bed springs that squeak when you roll over, sneakers that squeak on a polished basketball court, car brakes that squeak when dusty, a shopping cart with a squeaky wheel, a bicycle chain that squeaks when dry, and a balloon that squeaks when you slowly let air out. Animals like mice, guinea pigs, and hamsters are squeaky when they chirp. Toys like squeaky dog toys, rubber ducks, and baby shoes with built-in squeakers are intentionally squeaky. Even people can be squeaky if they have a high-pitched voice or a squeaky laugh. The cause of squeakiness is usually friction between two surfaces in stick-slip motion or air forced through a narrow reed, creating high-frequency vibrations. So anything that rubs, needs oil, or has a squeaker inside can be squeaky.
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