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Translation and English learning by Britannica
merriam webster
on the sly
a escondidas
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on, the, sly.
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sly adjective

unfavorite favorite play sound
astuto, taimado; soplado

Example sentences of
sly adjective

  • •The movie pairs a sly, dissembling ex-con with an upstanding, straight-arrow cop.
  • •Why, you sly fellow! I had no idea you were planning my birthday party.
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Synonyms of
sly adjective

cunning, crafty, foxy, wily, slick, devious, sneaky, underhanded