Etymology
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vanish (v.)
"disappear quickly," c. 1300, from shortened form of esvaniss-, stem of Old French esvanir "disappear; cause to disappear," from Vulgar Latin *exvanire, from Latin evanescere "disappear, pass away, die out," from ex "out" (see ex-) + vanescere "vanish," inchoative verb from vanus "empty, void," from PIE *wano-, suffixed form of root *eue- "to leave, abandon, give out." Related: Vanished; vanishing; vanishingly. Vanishing point in perspective drawing is recorded from 1797.
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*eue- 
*euə-, Proto-Indo-European root meaning "to leave, abandon, give out," with derivatives meaning "abandoned, lacking, empty."

It forms all or part of: avoid; devastation; devoid; evacuate; evanescent; vacant; vacate; vacation; vacuity; vacuole; vacuous; vacuum; vain; vanish; vanity; vaunt; void; wane; want; wanton; waste.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit una- "deficient;" Avestan va- "lack," Persian vang "empty, poor;" Armenian unain "empty;" Latin vacare "to be empty," vastus "empty, waste," vanus "empty, void," figuratively "idle, fruitless;" Old English wanian "to lessen," wan "deficient;" Old Norse vanta "to lack."
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evanesce (v.)
"vanish by degrees, melt into thin air," 1817, a back-formation from evanescence, or else from Latin evanescere "disappear, vanish, pass away," figuratively "be forgotten, be wasted," from assimilated form of ex "out" (see ex-) + vanescere "vanish," inchoative verb from vanus "empty, void" (from PIE *wano-, suffixed form of root *eue- "to leave, abandon, give out").
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evanescent (adj.)
1717, "on the point of becoming imperceptible," from French évanescent, from Latin evanescentem (nominative evanescens), present participle of evanescere "disappear, vanish, pass away," figuratively "be forgotten, be wasted," from assimilated form of ex "out" (see ex-) + vanescere "vanish," inchoative verb from vanus "empty, void" (from PIE *wano-, suffixed form of root *eue- "to leave, abandon, give out"). Sense of "quickly vanishing, having no permanence" is by 1738.
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dwindle (v.)

"diminish, become less, shrink," 1590s (Shakespeare), apparently diminutive and frequentative of dwine "waste or pine away," from Middle English dwinen "waste away, fade, vanish," from Old English dwinan, from Proto-Germanic *dwinana (source also of Dutch dwijnen "to vanish," Old Norse dvina, Danish tvine "to pine away," Low German dwinen), from PIE *dheu- (3) "to die" (see die (v.)). Related: Dwindled; dwindling.

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fleet (v.)
Old English fleotan "to float; drift; flow, run (as water); swim; sail (of a ship)," from Proto-Germanic *fleutan (source also of Old Frisian fliata, Old Saxon fliotan "to flow," Old High German fliozzan "to float, flow," German fliessen "to flow, run, trickle" (as water), Old Norse fliota "to float, flow"), from PIE root *pleu- "to flow."

Meaning "to glide away like a stream, vanish imperceptibly" is from c. 1200; hence "to fade, to vanish" (1570s). Related: Fleeted; fleeting.
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skyrocket (n.)
1680s, type of firework, from sky (n.) + rocket (n.2). The verb, in the figurative sense of "to rise abruptly and rapidly" (often with suggestion of 'and then explode and vanish'") is attested from 1895.
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go south (v.)
"vanish, abscond," 1920s, American English, probably from mid-19c. notion of disappearing south to Mexico or Texas to escape pursuit or responsibility, reinforced by Native American belief (attested in colonial writing mid-18c.) that the soul journeys south after death.
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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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dissipate (v.)

early 15c., dissipaten, "scatter or drive off in all directions," from Latin dissipatus, past participle of dissipare "to spread abroad, scatter, disperse; squander, disintegrate," from dis- "apart" (see dis-) + supare "to throw, scatter," which is apparently from a PIE *supi- "to throw, sling, cast" (source also of Lithuanian supu, supti "to swing, rock," Old Church Slavonic supo "to strew").

Intransitive sense of "become scattered or dispersed, vanish through diffusion" is from 1620s; that of "expend wastefully, scatter by foolish outlay" is from 1680s. Related: Dissipated; dissipates; dissipating.

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