broadyoudaoicibaDictYouDict[broad 词源字典]
broad: [OE] Broad’s close relatives are widespread in the Germanic languages (German breit, for example, Dutch breed, and Swedish bred), pointing to a prehistoric Germanic ancestor *braithaz, but no trace of the word is found in any non-Germanic Indo-European language. The original derived noun was brede, which was superseded in the 16th century by breadth. The 20th-century American slang noun use ‘woman’ may come from an obsolete American compound broadwife, short for abroadwife, meaning ‘woman away from her husband’; this was a term applied to female slaves in relation to their new ‘masters’.
=> breadth[broad etymology, broad origin, 英语词源]
broad (adj.)youdaoicibaDictYouDict
Old English brad "broad, flat, open, extended," from Proto-Germanic *braithaz (cognates: Old Frisian bred, Old Norse breiðr, Dutch breed, German breit, Gothic brouþs), which is of unknown origin. Not found outside Germanic languages. No clear distinction in sense from wide. Related: Broadly. Broad-brim as a style of hat (1680s, broad-brimmed) in 18c.-19c. suggested "Quaker male" from their characteristic attire.
broad (n.)youdaoicibaDictYouDict
"woman," slang, 1911, perhaps suggestive of broad (adj.) hips, but it also might trace to American English abroadwife, word for a woman (often a slave) away from her husband. Earliest use of the slang word suggests immorality or coarse, low-class women. Because of this negative association, and the rise of women's athletics, the track and field broad jump was changed to the long jump c. 1967.