Last Updated：2025/11/20

(idiomatic) Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.

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on the sly

Source Word

on the sly

idiomatic

(idiomatic) Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.

Japanese Meaning

こっそりと / ひそかに / 内密に / 秘密裏に

She slipped into the kitchen on the sly to steal a midnight snack.

彼女は夜中にこっそり台所に忍び込み、夜食を盗もうとした。

Sense（1）

(idiomatic) Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.

This diversion was enjoyed on the sly, and unknown to the ladies of the house.