Definitions for on the sly
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Princeton's WordNet
furtively, on the sly(adverb)
in a furtive manner
"the soldiers were furtively crawling through the night"
Wiktionary
on the sly(Adverb)
Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.
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"on the sly." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/on the sly>.

