out ‧ box BrE AmE , out box /ˈaʊtbɒks $ -bɑːks/ noun [countable]
1 . the place in a computer email program where messages that you have not sent yet are stored ⇨ ↑ inbox
2 . American English a container on an office desk that is used to hold letters, documents etc that have been dealt with and are ready to be taken away by someone such as a secretary SYN out tray British English