X out
Also found in: Idioms.
X out
To close an application or dialog box by clicking the X icon at the top of the window. Used as a synonym for "cross out" in English, X out has another meaning in the computer. See X button.Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.