On the sly and Under cover

On the sly

On the sly adverb - In a furtive manner.

Under cover and on the sly are semantically related in in secret topic. In some cases you can use "Under cover" instead the phrase "On the sly" as an adverb or an adjective.

Under cover

Definitions of On the sly not found.

On the sly and under cover are semantically related in secret topic. You can use "On the sly" instead the phrase "Under cover" as an adverb or an adjective, if it concerns topics such as sneaky, underground, clandestine.
Cite this Source
Under cover and On the sly. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/on_the_sly/under_cover
On the sly & Under cover. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/on_the_sly/under_cover>.
Under cover or On the sly. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/on_the_sly/under_cover.