上海教育出版社《汉语成语词典》给“噬脐莫及”是这样下注解的:“噬脐:用嘴咬肚脐,够不着。形容后悔时就像嘴咬肚脐一样,即后悔已经晚了。又作‘噬脐何及’。” 商务印书馆《现代汉语词典》也采此说:“咬自己的肚脐是够不着的,后来用:噬脐莫及’比喻后悔莫及。” Shanghai Education Press “Dictionary of Chinese idioms” to “bite the umbilical Mo” is the following comment: “Eviscerate umbilical: mouth napping, enough to describe the regret when the mouth like a navel, that regret is too late. Also as ’what is the umbilical umbilical cord.’ ”Commercial Press Modern Chinese Dictionary also adopted:“ to bite your navel is not enough, and later with: pharynx ”metaphor regrettable.