kneecap
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子どものころは膝小僧にいつも傷があった。
When I was a child, I always had scrapes on my knees.
転んで膝小僧をすりむいた。
I fell and scraped my knee.
夏になると膝小僧を出して遊んでいた。
In summer, we used to play around with our bare knees showing.