Комментарии:Both meanings are probably derived from 長 *traŋʔ 'to become long, grow up; elder, senior' (q.v.) ("elder, senior" > "respected person"; "to measure length" > "measure of earth, measure of length"). The meaning "respected person" gave rise (as early as in Han) to a narrower meaning "father-in-law". In this sense the word was borrowed in Viet. as du'ọ'ng 'stepfather; husband of one's aunt or sister' (the regular Sino-Viet. rendering of 丈 is tru'ọ'ng).