大半夜

the middle of the night

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)

more than half / greater part / most / probably / most likely

half / semi- / incomplete / (after a number) and a half

midnight / in the middle of the night

variant of 夜[ye4]

night