Knee/niː/ Definition 1 of 3Pro Tip 1/3Body Movement Used to describe activities that involve bending the legs, like kneeling or squatting. The exercise requires you to bend your knees repeatedly. Pro Tip 2/3Injury Reference Often mentioned in discussions about leg injuries or medical conditions. After the run, my left knee was swollen. Pro Tip 3/3Symbol of Respect Bending the knee can show respect, submission, or worship in many cultures. The knights bent their knees before the queen.