implosion
    n 1: a sudden inward collapse; "the implosion of a light bulb"
    2: the initial occluded phase of a stop consonant

Implosion \Im*plo"sion\, n. [Formed by substitution of pref. im-
   in for pref. ex- in explosion.]
   1. A bursting inwards, as of a vessel from which the air has
      been exhausted; -- contrasted with explosion.
      [1913 Webster]

   2. Hence: The inward-moving detonation wave cause by
      detonation of explosives arrayed spherically around a
      core; -- a technique used in atomic bombs to compress
      fissionable material to allow a chain reaction time to
      produce an explosion of the fissionable material.
      [PJC]

   3. (Phon.) A sudden compression of the air in the mouth,
      simultaneously with and affecting the sound made by the
      closure of the organs in uttering p, t, or k, at the end
      of a syllable (see Guide to Pronunciation,
      [sect][sect]159, 189); also, a similar compression made by
      an upward thrust of the larynx without any accompanying
      explosive action, as in the peculiar sound of b, d, and g,
      heard in Southern Germany. --H. Sweet.
      [1913 Webster]