一笔的字最难讲,因为一笔里没有可以拆开比对的部件,说法就多。《说文》说“乃,曳词之难也。象气之出难”,把这一笔看成话说不顺、气出不畅的样子——那是从用法倒推字形。另一说认为它画的是人侧身垂下的乳,后来写作“奶”,“乃”是本字。还有人说画的是一条垂下的绳。三说都拿不出别的字形来印证,一笔之中也看不出更多,所以这里标作有争议。卜辞里它的用法倒是明白的:一是“你的、他的”,“乃兄”“乃父”;二是接连两件事,先这样,“乃”那样。它和下一个字“迺”在卜辞里分工大致清楚——“迺”多用来接事,“乃”多用来指人——但两个字也有互用的地方,这一层也还在讨论中。
一筆的字最難講,因為一筆裡沒有可以拆開比對的部件,說法就多。《說文》說「乃,曳詞之難也。象气之出難」,把這一筆看成話說不順、氣出不暢的樣子——那是從用法倒推字形。另一說認為它畫的是人側身垂下的乳,後來寫作「奶」,「乃」是本字。還有人說畫的是一條垂下的繩。三說都拿不出別的字形來印證,一筆之中也看不出更多,所以這裡標作有爭議。卜辭裡它的用法倒是明白的:一是「你的、他的」,「乃兄」「乃父」;二是接連兩件事,先這樣,「乃」那樣。它和下一個字「迺」在卜辭裡分工大致清楚——「迺」多用來接事,「乃」多用來指人——但兩個字也有互用的地方,這一層也還在討論中。
A character of one stroke is the hardest to explain, because a single stroke offers no parts to take apart and compare, and so the accounts multiply. 說文 says “乃 is the drag of speech that will not come; it draws breath coming out with difficulty”, which reads the stroke back out of the way the word is used. A second account has it drawing a breast on a body in profile, the original of the character later written 奶. A third has it drawing a hanging cord. None of the three can point to another character for support, and one stroke will not yield more, so the badge here says disputed. The use, by contrast, is plain. It serves as “your, his” — 乃兄, your elder brother; 乃父, your father — and it links two things in order, this first and 乃 that. Its division of labour with 迺, the next character in this chapter, is broadly clear on the bones, 迺 joining events and 乃 pointing at people, but the two do overlap, and that too is still being argued.