Han Xin endured the humiliation of crawling between someone's legs.
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胯下之辱 (kuà xià zhī rǔ, 'the humiliation under the crotch') is a famous idiom from the story of Han Xin (韩信), a great general of the Han dynasty. As a young man, a bully forced him to crawl between his legs. Han Xin endured it rather than fight, showing patience that later led to greatness.
⺼ is the flesh-meat radical, the left-side form of 肉. Body parts almost universally take this radical — 胯 (hip / crotch) sits next to 腰 (waist), 腿 (leg), 腹 (belly) and 脚 (foot). Visually identical to 月 (moon) but semantically distinct.
夸 (kuā) supplies the sound, tone-shifted to kuà. 夸 itself originally depicted a person with arms outstretched — a fitting echo for hips and stride. Same phonetic appears in 跨 kuà (step over), 垮 kuǎ (collapse) and 挎 kuà (carry on the arm).
