retro-fire

retrofire

[re-troh-fahyuhr] Rocketry.
verb (used with object), retrofired, retrofiring.
1.
to ignite (a retrorocket).
verb (used without object), retrofired, retrofiring.
2.
(of a retrorocket) to become ignited.

Origin:
1960–65, Americanism; retro- + fire

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
retrofire (ˈrɛtrəʊˌfaɪə)
 
n
1.  the act of firing a retrorocket
2.  the moment at which it is fired

Collins English Dictionary - Complete & Unabridged 10th Edition
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