knees
n. countable A1 Beginner US //ˈniz// UK //nˈiːz// knees
n. the joints in the middle of your legs that allow you to bend them. You use these when you sit down, run, or climb stairs.
n. the joints between the thigh and the lower leg in humans. Plural form of knee; functions as the primary hinge joint of the lower limb.
He fell down and hurt his knees.
The athlete wore protective pads on both knees to prevent injury during the volleyball match.
Years of high-impact running had taken a toll on his knees, leading to a chronic inflammation that eventually required surgical intervention to restore full mobility.
Usage
Commonly used in the plural when referring to the general area of the legs or a person's posture.