Definitions for on the fly
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Princeton's WordNet
on the fly(adverb)
on the run or in a hurry
"she wrote those letters on the fly"
Wiktionary
on the fly(Adverb)
Spontaneously or extemporaneously; done as one goes, or during another activity.
Citation
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"on the fly." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/on the fly>.