Etymology
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kneecap (n.)

1650s, "a covering or protection for the knee," from knee (n.) + cap (n.). Meaning "bone in front of the knee joint" is from 1869; the verb in the underworld sense of "to shoot (someone) in the knee" as punishment is attested by 1975. Related: Kneecapped.

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Definitions of kneecap
1
kneecap (v.)
shoot in the kneecap, often done by terrorist groups as a warning;
They kneecapped the industrialist
2
kneecap (n.)
a small flat triangular bone in front of the knee that protects the knee joint;
Synonyms: patella / kneepan
From wordnet.princeton.edu