A yardbird is post-Second World War African American slang for "prisoner", from the notion of prison yards. During the Second World War, in the armed forces it meant "basic trainee", as they spent most of their time in the yards.
yardbirdとは意味:{名} : 囚人{しゅうじん}、新兵{しんぺい} yardbird meaning: Noun: yardbird Usage: N. Amer A military recruit who is assigned menial tasks - yard bird A person serving a sentence in a jail or prison - convict , con , inmate , yard bird ...yardbird en francais:n. soldat retenu dans une zone limitée comme punition; soldat soumis à des peines de punition; prisonnieryardbird 뜻:noun, 초년병, 죄수yardbird перевод:1) _сл. _воен. новобранец 2) _сл. _ам. пехотинец 3) _сл. _воен. получивший наряд вне очереди 4) _сл. заключенный