disappear

v. go out of sight; become extinct, cease to exist

A forced disappearance occurs when an organization forces a person to vanish from public view, either by murder or by simple sequestration. The victim is first kidnapped, then illegally detained in concentration camps, often tortured, and finally executed and the corpse hidden. In Spanish and Portuguese, "disappeared people" are called desaparecidos, a term which specifically refers to the mostly South American victims of state terrorism during the 1970s and the 1980s, in particular concerning Operation Condor.
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Verb
1. get lost, especially without warning or explanation; "He disappeared without a trace"
(synonym) vanish, go away
(antonym) appear
(hyponym) fall off, fall away
(derivation) disappearance, disappearing
2. become invisible or unnoticeable; "The effect vanished when day broke"
(synonym) vanish, go away
(hypernym) end, stop, finish, terminate, cease
(hyponym) dematerialize, dematerialise
(derivation) disappearance
3. cease to exist; "An entire civilization vanished"
(synonym) vanish
(antonym) appear, come along
(hypernym) end, stop, finish, terminate, cease
(derivation) fade, disappearance
4. become less intense and fade away gradually; "her resistance melted under his charm"
(synonym) melt
(hypernym) weaken

(v. i.)
To cease to be or exist; as, the epidemic has disappeared.
  

(v. i.)
To cease to appear or to be perceived; to pass from view, gradually or suddenly; to vanish; to be no longer seen; as, darkness disappears at the approach of light; a ship disappears as she sails from port.
  

bu2 yi4 er2 fei1
To fly without wings.
To disappear without trace. To vanish all of a sudden. To spread like wildfire.

sai4 weng1 shi1 ma3
The old man at the border lost his horse.
What looks like a bad ending may turn out to be good or at least better than it looks at first sight. A temporary loss may turn out to be a gain. A blessing in disguise.