on the sly

Meaning: Secretly, so as not to be seen.

Language: English

Literally: (Already vivid in English)

Example: “He fed the neighbor's cat on the sly for weeks.”

Category: Daily Life

Origin: "Sly" comes from a Norse word meaning cunning or skillful. The phrase is recorded from the early 19th century.

Equivalents in other languages

More idioms — Daily Life

More English idioms

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