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implode

American  
[im-plohd] / ɪmˈploʊd /

verb (used without object)

implodes, present (3rd person singular) imploded, past participle, past imploding present participle
  1. to burst inward (opposed to explode).


verb (used with object)

implodes, present (3rd person singular) imploded, past participle, past imploding present participle
  1. Phonetics. to pronounce by implosion.

implode British  
/ ɪmˈpləʊd /

verb

  1. to collapse or cause to collapse inwards in a violent manner as a result of external pressure

    the vacuum flask imploded

  2. (tr) to pronounce (a consonant) with or by implosion

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Etymology

Origin of implode

First recorded in 1880–85; im- 1 + (ex)plode

Explanation

When something implodes, it explodes inward — instead of outward. With extremely large buildings, it helps to implode them rather than explode them, because by falling inward they take up less space. Why bother to have a word like implode when you already have explode? Well, imagine there is something deep beneath the sea, being subjected to the intense pressure there. If the pressure is high enough that the object bursts, it would collapse in rather than out. It would, in fact, implode. People also sometimes use implode to describe a person subjected to intense pressures who, emotionally at least, bursts inward: "All that stress just made Jess implode."

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