1. big; large; great
2. older (than another person)
3. eldest (as in 大姐 dàjiě)
4. greatly; freely; fully
5. (dialect) father
6. (dialect) uncle (father's brother)

1. ox
2. cow
3. bull
4. newton (abbr. for 牛顿 niúdùn)
5. (slang) awesome

classifiers: 條, 頭