on the sly
Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.
This diversion was enjoyed on the sly, and unknown to the ladies of the house.
sly
UK /slaɪ/ US /slaɪ/
adj 4name 2adv 1
Definitions
adj
1
Artfully cunning; secretly mischievous; wily.
2
Dexterous in performing an action, so as to escape notice
3
Done with, and marked by, artful and dexterous secrecy; subtle
a sly trick
4
Light or delicate; slight; thin.
adv
1
Slyly.
name
1
A diminutive of the male given name Sylvester.
2
A surname
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