B1 the middle joint of the leg that allows the leg to bend膝,膝盖
the part of a piece of clothing that covers the knee(裤子的)膝部
More examples
He fell down and grazed his knee.
He bounced the baby on his knee.
Make sure you bend your knees when you're picking up heavy objects.
She sat back in her chair and wrapped her arms around her knees.
Football socks go up to the knee, don't they?
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