• 卑いやしい — lowly; vulgar; greedy
• 卑いやしむ — to look down on; to despise
• 卑下ひげ — self-deprecation; belittling oneself
• 卑屈ひくつ — overly servile; lacking pride
• 卑劣ひれつ — despicable; underhanded; mean-spirited
• 卑近ひきん — familiar and down-to-earth; homely

The shape of 卑 comes from a person crouching low, holding a vessel in both hands. It suggests someone in a low position, either socially or in spirit. From that picture, 卑 came to mean low, base, or lacking dignity, and it appears in words for both looking down on others and belittling oneself.