大副

first mate / first officer (of a ship)

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)

secondary / auxiliary / deputy / assistant / vice- / abbr. for 副詞|副词 adverb / classifier for pairs, sets of things & facial expressions