From Longman Dictionary of Contemporary Englishin trayˈin tray noun [countable] BBOa container on your desk for work and letters that need to be dealt with OPP out tray
Examples from the Corpus
in tray• I carried in tray after tray of Whiskas to the Gairloch store.From Longman Business Dictionaryin-trayˈin-tray noun [countable] British EnglishOFFICE a flat container used to hold letters, papers etc that need to be dealt withSYNin-basket AmEOpen all the incoming mail and place it in the appropriate person’s in-tray. → compare out-tray 