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
/slaɪ/
adj 4name 2adv 1
Collocations
5ADJ.
ancient, insolent, old
VERB + SLY
appears, aren't, cake, don't
SLY + NOUN
dog, fox, guy
PREP.
on, on, with
ADV.
often
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