king / magnate / person having expert skill in something

robber baron (in opera, old stories) / magnate

see 大夫[dai4 fu5]

big; large; great / older (than another person) / eldest (as in 大姐[da4 jie3]) / greatly; freely; fully / (dialect) father / (dialect) uncle (father's brother)

king or monarch / best or strongest of its type / grand / great

to rule / to reign over