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Use "knock-knees" in a sentence
"She had knock-knees and was skinny, with a short pixie haircut."
"Although rarely serious, children also can be evaluated and followed for conditions such as bowlegs, knock-knees and pigeon toes."
"It's being six foot two and desperate-looking that does it, you know; if I'd been short-arsed with no chin and knock-knees, no one in search of a hero would have looked at me twice."