mod. secretly and deceptively. : She was stealing little bits of money on the sly.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Slang Dictionary
sly definition
mod. excellent; cool. : That is really a sly jacket you got there.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
Cite This Source
American Heritage
Idioms & Phrases
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]
