"kneecap" in the noun sense
1. patella, kneecap, kneepan
a small flat triangular bone in front of the knee that protects the knee joint
"kneecap" in the verb sense
1. kneecap
shoot in the kneecap, often done by terrorist groups as a warning
"They kneecapped the industrialist"
Source: WordNet® (An amazing lexical database of English)
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