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v. dis·ap·peared, dis·ap·pear·ing, dis·ap·pears
1. To pass out of sight; vanish: The moon disappeared behind the clouds.
2. To cease to be seen; be missing or unfound: Her purse disappeared from her locker. The plane disappeared somewhere over the Pacific Ocean.
3. To cease to exist: Dinosaurs disappeared at the end of the Cretaceous Period.
To cause (someone) to disappear, especially by kidnapping or murder.

dis′ap·pear′ance n.
Synonyms: disappear, evanesce, evaporate, fade, vanish
These verbs mean to pass out of sight or existence: a skyscraper disappearing in the fog; time seeming to evanesce; courage evaporating; memories fading away; hope slowly vanishing.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.disappearing - the act of leaving secretly or without explanationdisappearing - the act of leaving secretly or without explanation
departure, going, going away, leaving - the act of departing
vanishing - a sudden disappearance from sight
References in classic literature ?
Without thinking about it, he accepted this disappearing into the wall as a peculiarity of his father, as milk and half- digested meat were peculiarities of his mother.
Then there came a time when the grey cub no longer saw his father appearing and disappearing in the wall nor lying down asleep in the entrance.
I caught a glimpse of a black mass disappearing in the east, its beacon lights dying out in the distance.
The last Sioux were disappearing in the south, along the banks of Republican River.
The appearance of this part of Africa was, moreover, quite calculated to inspire alarm: the desert was gradually expanding around them; not another village was to be seen--not even a collection of a few huts; and vegetation also was disappearing.
With his glass he scrutinized every quarter of the horizon; he saw the last rising ground gradually melting to the dead level, and the last vegetation disappearing, while, before him, stretched the immensity of the desert.
Disappearing Email messages are encrypted using a key borrowed from a server hosted by Disappearing Inc.
amp;uot;Email is actually very dangerous right now because private, casual email conversations frequently become permanent, public records,&uot; said Maclen Marvit, Disappearing Inc.
the provider of the ubiquitous Sendmail(R) Internet Mail platform for e-communications, applications and services, today announced a new technology partnership with Disappearing Inc.
Disappearing Email makes unwanted messages vanish; former Netscape
Unprotected email is like a postcard - the wrong people can read it, there is no proof of delivery, and it stays around forever," said Maclen Marvit, CEO of Disappearing Inc.
Digital and permanent are no longer synonymous: Although it once was the case that content posted online stayed there forever, platforms such as Snap-chat and Instagram Stories have changed this with disappearing content.