Definition of weak at/in the knees
- The announcement made me weak at the knees.
- She said hello to me and I went weak in the knees.
: lacking strength: such as
: deficient in physical vigor : feeble, debilitated
: not able to sustain or exert much weight, pressure, or strain
: 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
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