The word "不言而喻" is formed by combining four characters: 不 (not), 言 (to speak), 而 (a grammatical particle denoting consequence), and 喻 (to understand). These characters are arranged in a sequence where 不 negates 言, creating "not speak", and 而 links this to 喻, resulting in the literal meaning "without speaking, one understands". This construction directly conveys the idea that something is so obvious it requires no explanation, with each character contributing its core meaning to the overall phrase.