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retrofire

[re-troh-fahyuh r]Rocketry.
verb (used with object), ret·ro·fired, ret·ro·fir·ing.
  1. to ignite (a retrorocket).
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verb (used without object), ret·ro·fired, ret·ro·fir·ing.
  1. (of a retrorocket) to become ignited.
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Origin of retrofire

An Americanism dating back to 1960–65; retro- + fire
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for retrofire

retrofire

noun
  1. the act of firing a retrorocket
  2. the moment at which it is fired
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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