Etymology
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disappear (v.)

early 15c., disaperen, "cease to be visible, vanish from sight, be no longer seen," from dis- "do the opposite of" + appear. Earlier was disparish (early 15c.), from French disparaiss-, stem of desapparoistre (Modern French disparaître).

Transitive sense, "cause to disappear," is from 1897 in chemistry; by 1948 of inconvenient persons. Related: Disappeared; disappearing; disappears. Slang disappearing act "fact of absconding, action of getting away," is attested by 1884, probably originally a reference to magic shows.

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Definitions of disappear

disappear (v.)
get lost, as without warning or explanation;
He disappeared without a trace
Synonyms: vanish / go away
disappear (v.)
become invisible or unnoticeable;
Synonyms: vanish / go away
disappear (v.)
cease to exist;
Synonyms: vanish
disappear (v.)
become less intense and fade away gradually;
Synonyms: melt / evaporate
From wordnet.princeton.edu