sly

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a sly dog

Someone who, through cunning, devious, or dishonest means, achieves a fortuitous outcome. What a sly dog, he managed to get a copy of the test so he could memorize the answers ahead of time!
See also: dog, sly

on the sly

Secretly; in a clandestine or furtive manner. Even though he said he'd quit smoking, he still kept up the habit on the sly. The senator had been taking bribes from lobbyists on the sly for years before he was caught.
See also: on, sly

(as) sly as a fox

Exceptionally clever, cunning, or shrewd, especially in devious or underhanded ways. He thought he was being sly as a fox in the way he had been skimming money from the cash registers, but management caught up with him eventually. The novel centers around the cat-and-mouse chase between a police detective and a thief who is as sly as a fox. She may come off as nothing but smiles and sunshine, but trust me—she's sly as a fox!
See also: fox, sly

on the sly

Fig. secretly and deceptively. She was stealing little bits of money on the sly. Martin was having an affair with the maid on the sly.
See also: on, sly

*sly as a fox

 and *cunning as a fox
Cliché smart and clever. (*Also: as ~.) My nephew is as sly as a fox. You have to be cunning as a fox to outwit me.
See also: fox, sly

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]
See also: on, sly

do something on the ˈsly

do something secretly: She didn’t seem to have much appetite for dinner. I wonder if she’s been eating chocolates on the sly? OPPOSITE: (out) in(to) the open
See also: on, sly, something

on the sly

mod. secretly and deceptively. She was stealing little bits of money on the sly.
See also: on, sly

sly

mod. excellent; cool. That is really a sly jacket you got there.

on the sly

In a way intended to escape notice: took extra payments on the sly.
See also: on, sly

on the sly

Secretly, furtively. This early-nineteenth-century term appeared in a letter of John Keats’s (1818): “It might have been a good joke to pour on the sly bottle after bottle into a washing tub.” It remains current.
See also: on, sly
References in periodicals archive ?
Inspector General blasted the INS for its "dysfunctional" and "anti-quaked" paper-based tracking system that allowed two of the hijackers It, attend a Florida flight school, and then issued student visas to them six months slier the terrorist attacks.
In the slier "Dance of Summer," Brenner pressed her wrist to forehead and cocked her eyes like a proud diva.
"Old school friends, booze-up pals, IRA comrades, hangers-on, admirers, and ex-lovers surrounded him on every street, in every pub, feeding him whiskey, bits of sly gossip, slier malice, thumps on the back...
Currently Slier is director of communication at the Washington, D.C.-based Council on Competitiveness, a nonprofit, nonpartisan coalition of chief executive officers from leading businesses, organized labor and universities.
A young man from the village of Abu Ghosh, near Jerusalem, had been sent to a mental hospital slier he had (on several occasions) run naked through the streets of his village, shouting at the top of his voice.
Cornish and Slier discovered that the large initiators cause plants to make rubber up to six times faster than the small ones.
He also admits to a strategy slier than direct confrontation which evolved from his first AIDS story, "Slim," titled for the popular name for AIDS in Africa.
We find, for instance, that Bishop Butler, in his Analogy of Religion (1736), was "slier" than James Beatty and Thomas Reid "in responding to Hume's necessarianism," as expressed in Hume's Treatise.
Attn: Maximiliano GacE[degrees]a Slier, Maximiliano GacE[degrees]a Slier
But a slier set of concerns emerges when one considers these weavers, busy with their "women's work," in relation to the pioneering figure of d'Harnoncourt herself.
Century 21 Construction of Clifton, NJ has completed a 70,000 square-foot expansion of Slier Distributing Company's distribution center in Totowa, NJ, announced.