A creak is a harsh, squeaking sound that happens when something old, stiff, or rusty moves or bears weight. Old wooden stairs often creak when you step on them, and rusty hinges creak when you open a door that hasn't been used in years. The sound comes from friction: parts rubbing together that don't move smoothly anymore.

The word captures a specific kind of sound that suggests age or wear. A brand-new floor doesn't creak, but after years of people walking on it, the floorboards might start to shift and groan. Trees creak in strong winds as their trunks and branches bend and sway. An old ship's timbers creak as the vessel rocks on the waves.

You'll often encounter this word in spooky stories, where creaking doors and floors create suspense. But creaking isn't always ominous: it's just the normal sound of wooden houses settling, furniture aging, or joints getting stiff. When someone says their knees creak when they stand up, they're comparing the sound their joints make to that same squeaky, grinding noise.