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noun \ˈau̇t-ˌbäks\

Simple Definition of out–box

  • : a box or other container on a desk in which letters, notes, etc., that are being sent from the desk are placed

  • computers : a computer folder that holds e-mail messages you have not yet sent

Source: Merriam-Webster's Learner's Dictionary

Full Definition of out–box

  1. :  a box or tray (as on a desk) for holding outgoing interoffice mail

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