implosion has the recorded history: Coined from implode (modeled on explosion / explode) with in- ('inward'), ultimately tracing to Latin plaudere ('to clap'). The path is chiefly one of transmission: the word passes through the named languages and forms, with each stage preserving part of the modern shape. In present English, the noun sense is "a violent collapse inward; a sudden internal failure", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as implode, explosion, and explode. Its semantic neighborhood includes collapse, cave-in, breakdown, and disintegration, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Latin plaudere.