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| Date: | 1200-1300 |
| Language: | Old Norse |
| Origin: | slgr |
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sly
1 someone who is sly cleverly deceives people in order to get what they want [= cunning]
2 a smile, look etc that shows you know something secret : 
He leaned forward with a sly smile.
sly smile/glance/wink etc
He leaned forward with a sly smile.3 secretly, especially when you are doing something that you should not do : They'd been seeing each other on the sly for months.
on the sly
informalThey'd been seeing each other on the sly for months. —slyly adverb
—slyness noun [uncountable]
