on the sly
Furtively, secretly, as in She's always eating cookies on the sly. The adjective sly, which means “cunning” or “crafty,” is here used as a noun. [c. 1800]
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Example sentences from the Web for on the sly
Just the hard-on before you shoot unarmed members of the public.'Babylon' Review: The Dumb Lives of Trigger-Happy Cops|Melissa Leon|January 9, 2015|DAILY BEAST
France 24 is providing live, round-the-clock coverage of both scenes as they progress.
Sands was involved in a scandalous-for-the-time romance with the carpenter and there were rumors she was pregnant with his child.New York’s Most Tragic Ghost Loves Minimalist Swedish Fashion|Nina Strochlic|January 8, 2015|DAILY BEAST
Three on-the-record stories from a family: a mother and her daughters who came from Phoenix.I Tried to Warn You About Sleazy Billionaire Jeffrey Epstein in 2003|Vicky Ward|January 7, 2015|DAILY BEAST
You just travel light with carry-on luggage, go to cities that you love, and get to hang out with all your friends.Coffee Talk with Fred Armisen: On ‘Portlandia,’ Meeting Obama, and Taylor Swift’s Greatness|Marlow Stern|January 7, 2015|DAILY BEAST
Sleek finds it far harder work than fortune-making; but he pursues his Will-o'-the-Wisp with untiring energy.The Pit Town Coronet, Volume I (of 3)|Charles James Wills
You never know when you are going to stumble upon a jewel in the most out-of-the-way corner.Music-Study in Germany|Amy Fay
Mr. Slocum was not educated in a university, and his life has been in by-paths, and out-of-the-way places.
I drew back from the rim of Writing-On-the-Stone, that set of whispered phrases echoing in my ears.Raw Gold|Bertrand W. Sinclair
Kingston-on-Thames is still provincial in appearance, though now the centre of a great growth of modern suburbs.The Portsmouth Road and Its Tributaries|Charles G. Harper