on the sly

[slahy] Origin

sly

[slahy] adjective, sly·er or sli·er, sly·est or sli·est, noun
adjective
1.
cunning or wily: sly as a fox.
2.
stealthy, insidious, or secret.
3.
playfully artful, mischievous, or roguish: sly humor.
4.
on the sly, secretly; furtively: a tryst on the sly.

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On the sly is always a great word to know.
So is ninnyhammer. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.

Origin:
1150–1200; Middle English sly, sley < Old Norse slœgr sly, cunning

sly·ly, sli·ly, adverb
sly·ness, noun
un·sly, adjective
un·sly·ly, adverb
un·sly·ness, noun


1. artful, subtle, foxy, crafty, shrewd, astute. 2. surreptitious, furtive, underhand, clandestine.


1. direct, obvious.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source Link To on the sly
Etymonline
Word Origin & History

sly
c.1200, from O.N. sloegr "cunning, crafty, sly," from P.Gmc. *slogis (cf. Low Ger. slu "cunning, sly"), probably from base *slog- "hit" (see slay), with an original notion of "able to hit." Cf. Ger. verschlagen "cunning, crafty, sly," schlagfertig "quick-witted," lit. "ready
EXPAND
to strike," from schlagen "to strike." A non-pejorative use of the word lingered in northern Eng. dialect until 20c. On the sly "in secret" is recorded from 1812. Sly-boots "a seeming Silly, but subtil Fellow" is in the 1700 "Dictionary of the Canting Crew."
COLLAPSE
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

on the sly definition


  1. 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.
Cite This Source

sly definition


  1. 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]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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