on the sly (0 synonym found)

We don't have any synonyms for on the sly yet.

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on the way  ·  on the fly  ·  by the sly  ·  in the sky

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Definition of on the sly:

(v) : slyly, in an inconspicuous manner, so as not to be seen
Definition of on the sly:

(v) : slyly, in an inconspicuous manner, so as not to be seen
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