on the sly
  1. (idiomatic) Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.
    • 1857, William Makepeace Thackeray, The Virginians, ch. 16:
      This diversion was enjoyed on the sly, and unknown to the ladies of the house.
Synonyms Translations
  • French: en douce
  • Russian: втихаря́

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