on the sly


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Related to on the sly: get on, fall apart, catch up, stay put, turn up, called off

sly

 (slī)
adj. sli·er (slī′ər), sli·est (slī′ĕst) also sly·er or sly·est
1. Clever or cunning, especially in the practice of deceit.
2. Stealthy or surreptitious: took a sly look at the letter on the table.
3. Playfully mischievous: a sly laugh.
Idiom:
on the sly
In a way intended to escape notice: took extra payments on the sly.

[Middle English sleigh, from Old Norse slœgr.]

sly′ly adv.
sly′ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.on the sly - in a furtive manner; "the soldiers were furtively crawling through the night"
Translations
References in classic literature ?
You believe in a palace of crystal that can never be destroyed--a palace at which one will not be able to put out one's tongue or make a long nose on the sly.