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1. An electronic folder for outgoing emails or text messages.
2. A container for outgoing documents, located in or near one's office or work area.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (on a computer) a folder in a mailbox in which outgoing messages are stored and displayed
2. a US and Canadian name for out-tray
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Past participle: outboxed
Collins English Verb Tables © HarperCollins Publishers 2011