Definition of someone's knees are knocking
- Her knees were knocking in terror.
: some person : somebody
: a joint in the middle part of the human leg that is the articulation between the femur, tibia, and patella
: the joint in the hind leg of a four-footed vertebrate that corresponds to the human knee
: the carpal joint of the foreleg of a four-footed vertebrate
: to strike with the knee
: to bend the knee to
: to strike something with a sharp blow
: to collide with something
: a sharp blow : rap, hit
: a severe misfortune or hardship
: setback, reversal
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